IMPROVING THE EFFICIENCY OF WASTE HEAT RECOVERY SYSTEMS BY MEANS OF A COMBINED TURBINE-PELTIER SYSTEM

A computational fluid dynamics (CFD) approach of thermoelectric generator (TEG) for power generation

Modem SRM ignition transient modeling. V - Prospective developments in CFD simulation

A study on heat transfer enhancement in the radial direction of gas flow for thermoelectric power generation

Advances of Computational Fluid Dynamics (CFD) applications in agricultural building modelling: Research, applications and challenges

CFD approach to modelling, hydrodynamic analysis and motion characteristics of a laboratory underwater glider with experimental results

A novel thermoelectric generator equipped with magnetized Ferro-Fluid coolant for automobile exhaust heat Recovery: A numerical study

This paper presents flow simulations in packed beds by a coupled discrete element method (DEM) and computational fluid dynamics (CFD) approach. The realistic packing structure in packed beds is generated by DEM. Then the packing structure is imported into the CFD preprocessor to generate a mesh for flow simulations in packed beds. The subsequent CFD simulations are carried out. The predicted results reveal that not only the local behavior but also macroscopic quantities like the pressure drop depend remarkably on the local packing structural parameters, which is unable to be taken into account when using correlations with averaged values.

In this paper, the proposed novel technique using computational fluid dynamics (CFD) approach to design control systems is validated experimentally for a chip cooling device. Both experimental approach and CFD simulations are employed to extract the dynamic characteristics from the non-linear chip cooling system around a specific operating point, which are then used to construct the linear dynamic model for the chip cooling system. The linear dynamic model has two inputs, the heat load generated by the chip and the cooling fan voltage. The output is the temperature of the case housing the chip. The results from the linear dynamic model obtained by the CFD approach are compared with those obtained experimentally under the same dynamic conditions to validate the feasibility of using the CFD approach to design a control system for a thermal-fluid system.

Impact forces of submarine landslides on offshore pipelines

The performance of a micro-hydro system needs always to be improved so that the electrical power produced can be more optimal. This article aims to study numerically the effect of penstock dimensions on the potential of electrical energy in a micro-hydro system using a computational fluid dynamics (CFD) approach. The study of the effect of dimensions on the performance of a hydropower system is still quite rare. In this paper, the impact of dimensions on the micro-hydro system has been analysed by constructing thirty simulations of water flow in the penstock consisting of five variations of penstock slope ( and ) for six penstock diameter variations ( m, m, m, m, m, and m). The simulation was built using the open-source CFD software OpenFOAM which applies the finite volume method to solve the Navier-Stokes equation as a flow model. The simulated water velocity profile is then validated against the velocity profile of the analytical solution (power-law) for turbulent flow in the pipe. Energy loss analysis on the penstock has been carried out to determine the cause of the energy loss in the penstock characterised by loss coefficient . An enormous value will impact the decrease in the electric power potential of a micro-hydro system. The total length of the penstock induces the variation of the which affects the changes in the electrical power of the micro-hydro system. The shorter will increase the electric power potential of a micro-hydro system. With a high flow velocity of water in the penstock ( m/s), the electric power increases linearly with increasing the diameter value of the penstock. The analysis results show that the penstock dimensions can affect the changes in the electric power of the micro-hydro system. In addition, the work presented in this article has shown that the CFD approach can be used as a low-cost initial step in building an actual micro-hydro system

Influence of Porosity on the Performance of a Pulse Tube Refrigerator: A CFD Study

This work brings out the numerical simulation of the stir casting technique for aluminium silicon carbide Metal Matrix Composite (MMC) in a closed crucible and the effect of the blade geometry and rotational velocity on solidification of the metal matrix composite has been predictedusing Computational Fluid Dynamics (CFD) approach. The material used in the crucible is silicon carbide in aluminiummetal matrix. Geometric modelling and meshing have been carried out using ANSYS ICEM CFD. Computer simulations have been carried using the commercial CFD package, ANSYS FLUENT. The calculations used 2-D discrete phase, solidification and melting model and enthalpy method. Mushy state mixing, indicative of the solidification patterns have been studied to predict the most suitable ratio of crucible to blade dimensions and speed of stirring to obtain the most uniform type of solidification which in turn induces some enhanced mechanical properties to the casting.

Resistance and self-propulsion characteristics of a naval ship at full scale have been investigated by using Telfer’s GEOmetrically SIMilar (GEOSIM) method based on the computational fluid dynamics (CFD) approach. For this purpose, first, the resistance forces of the Office of Naval Research Tumblehome (ONRT) hull have been computed at different three model scales by using the overset mesh technique. The full-scale resistance and nominal wake fraction of the ONRT hull have been estimated by using Telfer’s GEOSIM method. Resistance and nominal wake fraction have then been compared with those of CFD at full scale. Later, the self-propulsion characteristics of the ONRT hull have been examined using Telfer’s GEOSIM method based on the CFD approach. Self-propulsion factors at the full-scale hull have been predicted by using the SST k–x turbulence model to involve 2-degrees of freedom ship motions (heave and pitch). Rotational motion of the propeller has also been simulated by using the rigid body motion technique. The results calculated by Telfer’s GEOSIM method and the 1978 International Towing Tank Conference (ITTC) extrapolation technique have been compared with each other and discussed with those of the CFD approach at full scale. It was found that the full-scale results (both resistance and self-propulsion factors) predicted by Telfer’s GEOSIM method are closer to those of the CFD approach than those of the 1978 ITTC technique. It can be noted that Telfer’s GEOSIM method is fast, robust, and reliable and can be used as an alternative to the 1978 ITTC method for predicting the self-propulsion performance of a full-scale ship. Introduction Resistance and self-propulsion characteristics of a surface ship should be known properly in the design stages. For this purpose, model tests and numerical methods are used together to determine the resistance and self-propulsion performance of a ship. However, model tests are expensive and time-consuming, and the accuracy of the International Towing Tank Conference (ITTC) extrapolation technique from model scale to full scale may not have in a satisfactory level. On the other hand, Telfer’s GEOmetrically SIMilar (GEOSIM) method based on computational fluid dynamics (CFD) can overcome these difficulties.

The static and dynamic derivatives have been investigated for a representative UCAV by a Computational Fluid Dynamic (CFD) approach based on the capability of elsA software. The configuration, named SACCON for Stability And Control CONfiguration, is a blended wing body with a moderately swept angle which has been developed for the purpose of this project. This CFD approach is based on static computations to determine the static derivatives and on the ALE (Arbitrary Lagrangian Euler) method coupled to steady or unsteady computations to obtain the dynamic derivatives. The computed and experimental global coefficients are compared as well as sectional pressure coefficients measured in DNWNWB wind-tunnel. The effects of sting support have been evaluated: the prediction of lift is improved with respect with the experimental data. The unsteady CFD results reproduce the complex dynamic behavior including for off design condition with non linear aerodynamic effects. The effect of the transition has been computed and compared to experimental results at low incidence.

CFD dispersion modelling for emergency preparadnes