Actual Flow Conditions Research Articles

Experimental Study of Sediment Erosion in Pelton Turbine Bucket

Abstract In hydroelectric power plants (HPPs), sediment-laden water flows through entire turbines, causing components to be damaged over time. Pelton turbine components serve abrasive erosion from particle hardness, and rough surface when subjected to high flow velocities and various jet impingement angles. In this study, an experiment was conducted to examine the erosion-prone areas of a small-scale Pelton turbine bucket under actual flow conditions. For the experiment, the Pelton bucket was painted with four distinct layers of paint: red, yellow, green, and blue. These layers served as indicators, helping us to visually track the erosion process. The setup was specifically designed to inject sediment upstream of the nozzle. It operated for a significant period of 0- 30 minutes, and every 5 minutes, the erosion pattern was noted with the nozzle fully open at 10 l/s and a net head of 6m with jet impingement angle 75°, 90°, and 105°. After operating for 0-30 minutes in sediment-laden flow conditions, a pattern of erosion was revealed, showing the hot spots (areas more susceptible to erosion) during the investigation at jet angles of 75°, 90°, and 105°. The most severe erosion areas are in the bucket domain, specifically at the splitter region and the deeper upper and lower parts of the brim. The erosion mechanism was influenced by the jet diameter and impingement angle on the bucket splitter. The experiment revealed that the outer regions of the bucket, where the flow was directed outward, suffered the most severe erosion, providing evidence of particle separation at high accelerations.

Study on Design Method of Diversion Pier in Channel Entrance Area with Complex Flow Characteristics

The entrance area is the main way for ships to enter and exit the approach channel. During the navigation period, the approach channel, the entrance area and the connecting section should avoid turbulence, whirlpool and other bad flow conditions. When conditions are limited and cannot be avoided, engineering or non-engineering measures should be taken to make it harmless to ensure the efficiency and safety of shipping. Aiming at improving the navigation safety effect of the estuary area, this paper analyzes the effect of improvement measures under the actual navigable flow condition by establishing the flow information fitting model and the prediction model of diversion pier setting, and provides the design method and basis for the installation of diversion pier in the estuary area to be predicted. It enriches the model base and knowledge base of the channel entrance area with complex flow characteristics, which has important practical significance and engineering value for shipping safety and waterway management.

Analysis and Exploration of the Impact of Average Sea Level Change on Navigational Safety in Ports

The primary clientele of a harbor is vessels, and vessels are primarily influenced by external forces such as wind (on the water surface), currents (underwater), and waves (affecting vessel stability). Therefore, it is necessary to comprehensively consider safety factors such as marine environmental forces and port characteristics. As ship sailing falls under applied science, acquiring marine meteorological information regarding ship routes can enhance port navigational safety. However, in the face of changes in the environmental conditions of harbor waters, it is essential to fully consider the impact of the external environment on ship maneuvering. One can effectively navigate complex operating environments by devising reasonable ship-handling plans. In the context of sea level rise caused by extreme climatic events, long-term variations, trends, and random factors are at play. Previous assessments of sea level rise have often relied on linear regression and the least squares method to determine coefficients. However, these methods fail to accurately capture the actual trend of sea level rise. Additionally, traditional harmonic analysis methods are unable to analyze sea level rise as well. Therefore, in this study, the techniques of simple moving average (SMA), empirical mode decomposition (EMD), and ensemble empirical mode decomposition (EEMD) were applied to analyze sea level rise. The obtained results of sea level rise under different analysis conditions were integrated with a hydrodynamic model that incorporates both wave and tidal characteristics to calculate the overall coastal dynamics parameters, which are crucial for ship navigation. The research findings contribute to the study of ship navigational safety issues by examining the distribution characteristics of port meteorology under climate change conditions. They offer valuable insights for mariners to assess navigational safety and devise maneuvering strategies based on the actual water flow conditions. Furthermore, the findings help identify and address potential risks and issues, ultimately ensuring the safety of navigation.

In-line measurements of the physical and thermodynamic properties of single and multicomponent liquids.

Microfluidic devices are becoming increasingly important in various fields of pharmacy, flow chemistry and healthcare. In the embedded microchannel, the flow rates, the dynamic viscosity of the transported liquids and the fluid dynamic properties play an important role. Various functional auxiliary components of microfluidic devices such as flow restrictors, valves and flow meters need to be characterised with liquids used in several microfluidic applications. However, calibration with water does not always reflect the behaviour of the liquids used inthe different applications. Therefore, several National Metrology Institutes (NMI) have developed micro-pipe viscometers for traceable inline measurement of the dynamic viscosity of liquids used in flow applications aspart of the EMPIR 18HLT08 MeDDII project. These micro-pipe viscometers allow the calibration of any flow device at different flow rates and the calibration of the dynamic viscosity of the liquid or liquid mixture used under actual flow conditions. The validation of the micro-pipe viscometers has been performed either with traceable reference oils or with different liquids typically administered in hospitals, such as saline and/or glucose solutions or even glycerol-water mixtures for higher dynamic viscosities. Furthermore, measurement results ofa commercially available device and a technology demonstrator for the inline measurement of dynamic viscosity and density are presented in this paper.

Numerical Modeling of an Impinging Jet Flow inside a Thermal Cut Kerf Using CFD and Schlieren Method

The dynamics of high-pressure gas flow injected through a nozzle during a thermal cutting process has an important effect on cutting performance. In this study, an actual gas flow condition inside a cut kerf of a plasma cut sample was simulated by considering various geometric features of the cut kerf, such as kerf width difference and cutting length difference between the top and bottom surfaces. A prototype cut kerf shape was fabricated using a transparent material. A gas flow shadowgraph from inside the fabricated cut kerf was observed using the Schlieren method. In addition, image processing was performed on images obtained with the Schlieren method before and after gas injection, which were used to validate the numerical simulation models. The effect of turbulent viscosity in various turbulent models was studied using computational fluid dynamics analyses. The results confirmed that the k–ω turbulent model was the most suitable turbulent model for the geometry used in this study. The simulation results for this model were qualitatively consistent with the reported experimental measurements.

A Comprehensive Review on Investigation of Sediment Erosion of Pelton Wheel Turbine

Hydro turbines installed at different hydropower plants face the issue of sediment erosion. Sediment erosion is an ambiguous phenomenon influenced by several parameters, including silt concentration, size, jet velocity, diameter, and fluid viscosity. Silt erosion imposes severe issues for hydropower plants, like shutdown and maintenance costs. The hydro turbine efficiency decreases with the increase in sediment erosion and eventually the breakdown of turbine components. Various researchers conducted small-scale experimental bench studies and numerical simulations to analyze the influence of the above-mentioned parameters on silt erosion, but the actual flow conditions are too complex to simulate. Therefore, no such erosion model has been developed to predict exact erosive wear. This paper presents an extensive review of the literature survey on sediment erosive wear of hydro turbines, both the adopted methodology by previous studies and parameters affecting sediment erosion in Pelton turbine are summarized. Based on literature studies, various aspects of erosive wear, parameters influencing it, and its severe effects on efficiency are thoroughly discussed. Appropriate remedial measurements for erosive wear made by multiple researchers, erosion models developed so far, and their measuring accuracy and the future scope of this research study are articulated in detail.

Design and development of non-recirculating type erosion test setup for hydraulic turbines

Slurry erosion phenomena are inevitable and commonly occurring processes in all types of hydro turbines and components that are exposed to sediment particles. The design of these components and the choice of the materials to resist erosion require laboratory testing using various erosion testing apparatus. These test apparatuses are designed specifically to meet the particular study requirements and to simulate the actual flow conditions in turbines. However, the design of these test apparatus must be flexible and versatile to assess erosion resistance under different combinations of operating conditions. The existing test rigs mostly comprise of rotary type with re-circulation of the slurry. This study proposes a new type of test setup that describes the sediment particles injection method into the system as well as immediate rejection of those particles striking the test specimen. The components of test rig and the test methodology are described. An accelerated tests have been performed on Cross-flow turbine to verify the suitability of the rig for erosion testing in laboratory environment. The design principle of this setup is to eliminate the limitations of the existing test rigs such as slurry ageing problem, use of acceleration tube to maintain the particle velocity and constant operating parameters (discharge velocity and pressure head). The non-recirculation of the slurry is maintained by the use of hydro cyclone as the particle separation device, which is found to have an efficiency of 97%. This test facility provides flexibility in the performance testing of miniature model of different types of hydro turbines with limited adjustments.

Contactless Inductive Flow Tomography for Real-Time Control of Electromagnetic Actuators in Metal Casting.

Flow control of liquid metals based on the actual flow condition is important in many metallurgical applications. For instance, the liquid steel flow in the mould of a continuous caster strongly influences the product quality. The flow can be modified by an electromagnetic brake (EMBr). However, due to the lack of appropriate flow measurement techniques, the control of those actuators is usually not based on the actual flow condition. This article describes the recent developments of the Contactless Inductive Flow Tomography (CIFT) towards a real-time monitoring system, which can be used as an input to the control loop for an EMBr. CIFT relies on measuring the flow-induced perturbation of an applied magnetic field and the solution of an underlying linear inverse problem. In order to implement the CIFT reconstructions in combination with EMBr, two issues have to be solved: (i) compensation of the effects of the change in EMBr strength on the CIFT measurement system and (ii) a real-time solution of the inverse problem. We present solutions of both problems for a model of a continuous caster with a ruler-type EMBr. The EMBr introduces offsets of the measured magnetic field that are several orders of magnitude larger than the very flow-induced perturbations. The offset stems from the ferromagnetic hysteresis exhibited by the ferrous parts of the EMBr in the proximity of the measurement coils. Compensation of the offset was successfully achieved by implementing a numerical model of hysteresis to predict the offset. Real-time reconstruction was achieved by precalculating the computationally heavy matrix inverses for a predefined set of regularization parameters and choosing the optimal one in every measurement frame. Finally, we show that this approach does not hinder the reconstruction quality.

Asymmetric Flow Control in a Slab Mold through a New Type of Electromagnetic Field Arrangement

This research aims to investigate the control effect of asymmetric flow in a slab mold using a novel magnetic field arrangement: freestanding adjustable combination electromagnetic brake (FAC-EMBr). Three scenarios (submerged entry nozzle moves to the narrow face, wide face of the slab mold, and rotates 10°) were studied using three-dimensional numerical simulation. The results show that the magnetic field generated by the FAC-EMBr system can effectively cover three key zones in mold and that the magnetic flux density in the zone cover by a vertical magnetic pole can be adjusted according to the actual flow condition. The FAC-EMBr can effectively improve the asymmetric flow in a mold and near the narrow surface caused by the asymmetric arrangement of the nozzle and can effectively inhibit the occurrence of the flow deviation phenomenon and stabilize the steel/slag interface fluctuation. At the same time, FAC-EMBr has obvious inhibition effects on the surface velocity and can optimize the asymmetric distribution of the surface velocity and the upper reflux velocity caused by the asymmetric arrangement of the nozzle. This study can provide theoretical evidence for the development and utilization of a new electromagnetic brake technology.

Acoustic wave propagation and its application to fluid structure interaction using the Cumulant Lattice Boltzmann Method

Splitter plates attached to a cylinder looking like hair (SPCH) is one of the self-adaptive devices used to control actual flow conditions, which in turn interact with Aeolian tones constituting a typical case of study in engineering industries. The direct numerical simulation of the sound waves stimulated by such devices is a complicated task due to the small levels of sound pressure and the time-consuming existing solvers. However, the Cumulant Lattice Boltzmann Method (LBM) provides stability and robustness at high Reynolds numbers and carries out these simulations satisfactorily. First, the fundamental acoustical properties of the Cumulant LBM are studied in this paper. Propagation of point and planar acoustic waves is considered including the temporal decay of a standing plane wave, the spatial decay of a planar acoustic pulse, and the propagation of spherical waves. Then, the Cumulant LBM as a fluid flow solver is coupled with a Finite Element structural mechanics solver to predict the effects of SPCH on the noise generated by cylinders at high Reynolds numbers as a practical fluid structure interaction (FSI) application. The spectral modification and possible acoustic damping impact of such flaps, plus the sound propagation from one and two circular cylinders are studied. A comparison of the theoretical and numerical results shows a reasonable capability of the Cumulant LBM to predict acoustical events with small errors in dissipation and dispersion. Furthermore, the results show that SPCH alter the phase of the vortex shedding cycle and decrease the transversal distance from the center line of the shed vortices. Flaps, thus, control the wake generated past a cylinder and have an effective impact on decreasing sound generation.

Comparative analysis of escalator capacity at metro stations: theory versus practice

The studies on escalators have mainly reported the walking speeds of passengers or their passenger handling capacity. Theoretical capacity is reported as a constant value for a given escalator speed, but is never achieved in the field. This creates practitioners’ dilemma regarding augmentation of the facility as some capacity will always remain available even under high passenger flows. This paper explores the issue and proposes a reference capacity for examining the effective utilisation of the escalator. The capacity is estimated with stand-only and stand-walk etiquette. The data available in the literature and from the video graphed information at metro stations in Delhi, India is used to examine the effect of step occupancy, walking speed of passengers and their proportion in the flow. It is observed that walking-factor and step occupancy is higher in developing countries. Walking factor is estimated as 0.70–0.74 and step occupancy as 0.80–1.70. The occupancy on walking side is estimated as one passenger per two steps as compared to the reported value of one per three steps. This indicates that the flow conditions on escalators in India are more restrictive as compared to other countries. The comparison of field capacity with reference capacity has indicated that the reference capacity can be used for the evaluation of actual flow condition on escalators.

Experiential Study of Measurement Comparison between Ocean Buoys and Wave Gauges in Large Wave Flume

The actual wave flow condition is difficult to control, so the real measurement accuracy of ocean wave buoy has not been verified. Based on the above background, this experiment conducted comparison test on two kinds of ocean wave buoys in the large-scale wave flume laboratory. Based on regular waves and under different conditions of period, velocity and wave height, the wave height measured by the 2m capacitive wave height meter was compared with the measured wave surface data by the buoy. The experimental results show that the relative error of wave height of SBF6-1 and SBF3-2 buoys is 1.2%∼15% and 2.5%∼14.2%. According to the results of spectrum comparison, the spectrum peak frequency of buoy and wave height instrument is relatively consistent under the same working conditions, but the difference of wave energy density at the spectrum peak frequency is obvious and the error range is 14%∼30%.

About Identifiability of Oil and Water Relative Permeability Curves and Reservoir Heterogeneity through Integrated Well Test Study

Relative permeabilities (RP) play an important role in reservoir engineering. RP functions together with the permeability anisotropy coefficient predetermine waterflooding efficiency and oil/water ratio in production forecast. Traditionally multiphase flow parameters are estimated from core analysis data. But such measurements suffer from small representative elementary volume (REV) and limited characterization of reservoir properties. Therefore using core data in 3D reservoir modelling could lead to distorted description of actual flow conditions. Despite those functions (RP) could be history matched with assimilated production data, such a procedure would require long history of waterflooding. So the authors’ idea is to apply integrated well test study to estimate the displacement efficiency and/or relative permeability functions at downhole conditions. Well testing is traditionally applied in reservoir engineering for single-phase reservoir parameters estimation. Our approach is extended to multi-phase flow and is based on data collection at well bottomholes and subsequent data assimilation in flow model.In this paper we summarize both features of mathematical problem statement and identifiability of multiphase parameters through inverse problem solution, but also discuss 10+ -year experience in interpretation of two-phase well testing using our technologies. To estimate multiphase parameters, we have to jointly consider complex data of well logging and dynamic data of well testing. Both data sets are used in the inverse problem quality criteria, where the least squares method has been applied. Forward problem corresponds to a 3D multiphase fluid flow model in porous media. The latter consists of continuity equation with multiphase Darcy equation instead of moment balances. For data assimilation modern methods of optimal control theory were successfully applied. For all synthetic test cases real reservoir parameters were accurately recovered through the use of forward simulation data.In order to estimate reservoir heterogeneity, we applied a single-phase model to get the ratio of vertical to horizontal permeability. Data of well self-interference testing were used for vertical permeability estimation. Depending on the depth of reservoir pressure perturbation, reservoir properties could be properly inferred from observations. Two other options of 3D interference testing using vertical and horizontal wells are also presented.In other words, all the problems considered are identifiable, and the level of their correctness is completely predetermined by the amount and quality of observed data. And transition to digital (intelligent) oil-and-gas production and closed-loop reservoir management [1] provides a possibility to remove discussed restrictions and all inverse problems considered should be accounted as fully identifiable.

Quantifying Erosion of Downhole Solids Control Equipment during Openhole, Multistage Fracturing

SummaryProppant flowback from hydraulic fracturing is widespread and costly due to erosion and/or blockage of producing hydrocarbons as proppant may accumulate downhole. Several strategies have been applied to avoid or minimize proppant flowback, such as treatment optimization to maximize pack stability, resin-coated proppant, limiting drawdown, or letting it flow to deal with the consequences later. Another strategy to avoid proppant flowback is to install sand control equipment integrated into a sliding sleeve device (SSD) as part of the completion string. Although the presence of sand control equipment can mitigate the problem, it raises concern about erosion during fracturing. Although some installations have been successful, one is known to have experienced sand control failure. This study aimed to understand the effect of hydraulic fracturing on the erosion of completion equipment with an objective of improving the design to, as much as possible, prevent erosion failure. Computational fluid dynamics (CFD) was used to evaluate the root cause and identify more robust design solutions.The first step was to identify the most probable causes of sand control failure during multistage fracturing (MSF) in openhole (OH) horizontals. The as-is completion was then modeled, along with the screen, SSD, fracturing port, and OH isolation packer. Because the fracture location between two packers is unknown, and the fracturing port was located between multiple screen/SSD assemblies, annular flow across the assembly in both directions was considered. State-of-the-art CFD simulations were then performed on the installed design using actual flow conditions (rates, slurry properties, treatment time) from the failed installation. A new quasidynamic mesh (QDM) methodology was developed, which yielded more realistic (albeit still conservative) erosion-depth predictions. The results revealed areas for improving the design of key components of the 10-ksi-rated system, and CFD was rerun to confirm erosion resistance targets. Design modifications were implemented, and improved products were then manufactured and field tested. For a new 15-ksi design, particle–particle interaction was added to the CFD analysis. The results of the CFD analysis and field test are presented herein.

Learning Model Parameters for Decentralized Schedule-Driven Traffic Control

Model-based intersection optimization strategies that produce signal timings over a specified optimization horizon have been widely investigated for urban traffic signal control, and recent work in this area produced a scalable approach to real-time traffic control based on a decentralized schedule-driven optimization model. In this approach, a scheduling agent is associated with each intersection. Each agent senses the traffic approaching its intersection through local sensors and in real-time constructs a schedule that minimizes the cumulative wait time of vehicles approaching the intersection over the current look-ahead horizon. Intersections then exchange schedule information with their neighbors to achieve network level coordination. Although the approach is general and has demonstrated substantial success, its effectiveness in a given road network depends on the extent to which various parameters of the model, e.g, maximum green time, are adjusted to match that network's actual flow conditions over time. To address this problem, we propose a two-stage hierarchical structure that combines online planning and reinforcement learning. Reinforcement learning is applied to adjust the parameters of the model over a longer time-scale. On the other hand, online planning is used to compute the schedule for managing the traffic signals in the shorter term. We demonstrate how this hybrid approach outperforms the original approach in real-time traffic signal control problems.

Simulation of Transient On-Road Conditions in a Closed Test Section Wind Tunnel Using a Wing System with Active Flaps

<div class="section abstract"><div class="htmlview paragraph">Typical automotive research in wind tunnels is conducted under idealized, stationary, low turbulence flow conditions. This does not necessarily reflect the actual situation in traffic. Thus, there is a considerable interest to simulate the actual flow conditions. Because of this, a system for the simulation of the turbulence intensity I, the integral linear scale L and the transient angle of incidence β measured in full-scale tests in the inflow of a test vehicle was developed and installed in a closed-loop, closed test section wind tunnel. The system consists of four airfoils with movable flaps and is installed in the beginning of the test section. Time-series of the flow velocity vector are measured in the empty test section to analyze the system’s envelope in terms of the turbulence intensity and the integral length scales. It is shown that the length scales in spanwise and in driving (streamwise) direction can be varied from 0.15 m to 7.9 m and from 0.15 m to 2.5 m, respectively, depending on the frequency of the flap movement. The maximum obtained turbulence intensity in the driving direction x is 3% and in the spanwise direction y 9.8%, depending on the flap’s amplitude. It is further shown that the turbulence intensity in driving direction can be increased to 5.6% with passive turbulence generators. Additionally, a model for predicting the flap movement reproducing the transient angle of incidence β measured in the on-road tests during an overtaking maneuver was developed. Measurements of the forces acting on the vehicle revealed an influence of the non-stationary flow on the non-stationary force coefficients. Finally, changes of up to 0.002 in Δc<sub>d</sub> and 0.157 in Δc<sub>s</sub> were measured.</div></div>

Performance Evaluation of Baffled and Floating Hybrid Constructed Wetland Operated Under Field Conditions

Baffled and Floating Hybrid Constructed Wetland (BFHCW) consisting of constructed wetland with brickbat medium and Floating Treatment Wetland (FTW) was developed and operated under actual field flow conditions. BFHCW was vegetated with dual-species (Typha angustifolia L. and Canna indica). The performance of continuously operated system was evaluated for varied Hydraulic Loading Rate (HLR) and Organic Loading Rate (OLR) for a longer period. The system was also assessed for controlled flow rate resulting more uniform OLR and HLR. The results showed that COD removal efficiency was enhanced by 5 to 15% with controlled flow than uncontrolled highly fluctuating flow conditions. HLR has more impact on COD removal than OLR. BFHCW is effective to an extent of 25 to 40% for COD removal. BFHCW is found to be cost effective and reasonably efficient treatment for pretreated domestic wastewater.

Design, Numerical Simulation and Experimental Investigation of Radial Inflow Micro Gas Turbine

The work arose initially from an interest in design of radial turbine for small scale gas turbine applications typically suitable for distributed power generation system which demands compact installations. The paper describes an investigation in to the design and performance of radial inflow turbines having a capacity of 25kW at 1,50,000 rpm. First a non-dimensional design philosophy is deduced to design a turbine rotor. The design approach is largely one dimensional along with empirical correlations for estimating losses used to obtain the main geometric parameters of turbine. From the proposed design approach, turbine total-to-static efficiency is calculated as 84.91% which is reasonably good. After that a modified vortex design procedure is developed to derive the non-dimensional volute geometry as a function of azimuth angle for actual flow condition. Once a specific turbine is designed, the flow is analyzed in detail using a three-dimensional Computational Fluid Dynamics (CFD) code in order to assess how accurately the performance is predicted by simple meanline analysis. Finally, a fully instrumented experimental setup is developed. The experimental investigations have been carried out to study the temperature and pressure distribution across turbine and total-to-static efficiency is calculated. The limitations of surging and choking in compressor as well as in the bearings to take up load at such high speed has allowed the tests to be conducted upto 70000 rpm only, with turbine inlet temperatures ranging from 900 K to 1000 K and a pressure ratio upto 1.79, which developed power in the range of 1.69 kW to 10.22 kW. The uncertainty bands are in order of ±13.76% to ±3.12%. It is observed that the CFD results are in good agreement with test results at off design condition. CFD models over predicted total to static efficiency by order of 7-8% at lower speed. These deviations are reduced as turbine runs close to design point.

Influence of Turbulence Statistics on Stochastic Jet-Noise Prediction with Synthetic Eddy Method

The separation algorithms that solve a flowfield and a sound field separately are used to estimate the jet noise accurately while suppressing the increase of computational cost. In this study, the synthetic eddy method (SEM) was applied to a strong shear flow to simulate a major sound source of jet noise, and the influence of turbulence statistics used in the SEM on the predicted far-field jet noise was investigated. The divergence-free SEM was employed as a reconstruction method of the turbulent field, and the shear effect due to the background flow was provided to the generated velocity field. In addition, the dissipation effect of the turbulence in the shear layer was modeled by decorrelating the generated velocity fluctuations. The estimated noise using the linearized Euler simulations appeared larger than the experimental value when parameters of the SEM were set based on actual flow conditions. In contrast, the sound pressure spectra agreed well with the experiment by increasing the time scale of the noise source. With the present stochastic noise prediction framework based on the SEM, turbulence statistics and far-field sound pressure spectra were correlated, which would help to modify parameters in stochastic noise generation methods to achieve desired far-field sound pressure spectra.

LNG 연료공급장치 적용을 위한 이중배관 시스템의 다물리 CAE 기반 설계 검증에 관한 연구

This study was carried out for design verification based on CAE of double piping system used in LNG fuel supply system. The double pipe is composed of an inner pipe through which LNG flows, an outer pipe through which air flows, and support for supporting between the inner pipe and the outer pipe. In order to apply the developed double piping system to the fuel supply system, it is necessary to secure air circulation characteristics, heat stability, structure stability, and vibration safety against gas leakage. Therefore, the verification of multiphysics research is required. The double piping used for LNG fuel supply system is an important equipment used in the engine room of LNG propulsion ships and safety design is very important because of the risk of secondary damage caused by LNG leakage. Therefore, in this study, multiphysics CAE technology is applied to review the safety while satisfying the design requirements of the developed double pipe. Considering the pressure loss of the fan, machine engine and pipeline, the predicted actual flow condition was predicted within the allowable flow range. In addition, the structural and dynamic stability analysis showed that the support operates in the safe area.