Numerical Simulation of Turbulent Flow in Eccentric Co-Rotating Heat Transfer

Abstract

Heat transfer engineering is significant in many applications, especially in buoyancy natural convection in concentric and eccentric cavities. The biggest practical challenges, in this context, are capturing the self-natural flow, estimating the mixing performance, and determining what parameters affect the temperature distribution in the cavity. In this paper, we focus on the improvement of a mathematical model, in order to enhance the accuracy of the solution, by investigating a new source term in the SST k−ω turbulence model based on the finite volume technique. The commercial numerical simulation software ANSYS Fluent 2021R1 is implemented to validate the accuracy. A concentric cavity was chosen for validation, the obtained temperature profiles at θ=0∘, θ=30∘, θ=60∘, θ=90∘, θ=120∘, θ=150∘, and θ=180∘ were compared with previous experimental data. We applied this model to four eccentric rotating scenarios, including inner counterclockwise rotation, outer counterclockwise rotation, inner–outer clockwise rotation, and inner clockwise–outer counterclockwise rotation. The numerical simulation results reveal that the new source term in the momentum equation can produce superior results in the concentric test-case. The proposed mathematical model can describe the heat transfer under the eccentric co-rotation scenario well. Furthermore, the results for eccentric cases confirm that the rotational direction affects the mixing temperature by generating a large vortex in the cavity, which increases the temperature mixing performance.

Modeling of Flow Heat Transfer Processes and Aerodynamics in the Cabins of Vehicles

“…The grid of finite volumes consisted of 32,518 tetrahedral cells with six fine wall layers. The mesh orthogonality parameter was 0.6, which, according to the Ansys documenta-tion [43,48], is indicated as "normal quality". Reducing the dimension of the elements did not lead to a significant difference in the results.…”

“…In this paper, the boundary value problem was simulated numerically by the finite volume method in the Ansys Fluent software product. The k − ω turbulence model was used as the most versatile model [43,48,[53][54][55][56].…”

“…In [35][36][37][38][39][40][41][42], the results of CFD analysis of thermal and hydrodynamic characteristics for various vehicles were presented, and optimization issues for various configurations and cab geometries were considered. Using numerical analysis based on СFD [43][44][45] Analytical determination of heat transfer coefficients relates to the solution of the system of Navier-Stokes equations. Hence, for free convection in a flat setting, methods for obtaining coefficients for flat horizontal and vertical plates and pipes were described [4][5][6][7][8][9][10].…”

“…In [35][36][37][38][39][40][41][42], the results of CFD analysis of thermal and hydrodynamic characteristics for various vehicles were presented, and optimization issues for various configurations and cab geometries were considered. Using numerical analysis based on CFD [43][44][45] makes it possible to obtain excellent results in modeling air flows, especially considering turbulence [46,47].…”

Numerical Simulation of Heat Transfer and Spread of Virus Particles in the Car Interior

“…Many analytical works relate to the actual problem of finding the heat transfer coefficients from the Nusselt criterion for harvesting machines [11], SUV vehicles [12][13][14][15][16], building elements [17], machinery cabins [18][19][20][21][22], and engineering systems [23][24][25]. This approach allows only internal regions to be considered, and thermal boundary conditions are modeled using heat transfer coefficients.…”