Hybrid methods for simulating hydrodynamics and heat transfer in multiscale (1D-3D) models

S A Filimonov,D V Boykov,E I Mikhienkova,A A Dekterev

doi:10.1088/1742-6596/899/5/052004

S A Filimonov, D V Boykov + Show 2 more

Open Access

https://doi.org/10.1088/1742-6596/899/5/052004

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Abstract

The work is devoted to application of different-scale models in the simulation of hydrodynamics and heat transfer of large and/or complex systems, which can be considered as a combination of extended and “compact” elements. The model consisting of simultaneously existing three-dimensional and network (one-dimensional) elements is called multiscale. The paper examines the relevance of building such models and considers three main options for their implementation: the spatial and the network parts of the model are calculated separately; spatial and network parts are calculated simultaneously (hydraulically unified model); network elements “penetrate” the spatial part and are connected through the integral characteristics at the tube/channel walls (hydraulically disconnected model). Each proposed method is analyzed in terms of advantages and disadvantages. The paper presents a number of practical examples demonstrating the application of multiscale models.

Highlights

In the contemporary world, the numerical simulation is practically indispensable when studying natural systems and designing technical objects
At solving problems of hydrodynamics, different modeling approaches are used depending on the type of the object
The calculation of the desired characteristics of such a system is carried out by methods based on the theory of hydraulic circuits (THC) [1]

Summary

Introduction

The numerical simulation is practically indispensable when studying natural systems and designing technical objects. The most striking example of the application of this method is the determination of the hydraulic resistance of non-standard element of the network model by means of spatial methods [11], or the definition of the input parameters of a complex device, after having calculated the lead-in pipeline fittings by network methods Undoubted advantage of this method is the possibility to use ready-made software products to calculate both parts of the task without any modifications, because the transmission of information between the parts of the model is carried out through the peripheral data transfer. A) spatial model of the combustion semi-chamber of the boiler; b) a network model of the hot air supply system; c) delivery duct of the secondary blast; 1, 2, 3– burner tiers

The hydrodynamically inified model

A hydrodynamically disconnected model

Combined model

Conclusions