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Numerical investigation of incompressible fluid flow and heat transfer across a bluff body in a channel flow

The Lattice Boltzmann Method is applied to computationally investigate the 
 laminar flow and heat transfer of an incompressible fluid with constant 
 material properties in a two-dimensional channel with a built-in bluff body. 
 In this study, a triangular prism is taken as the bluff body. Not only the 
 momentum transport, but also the energy transport is modeled by the Lattice 
 Boltzmann Method. A uniform lattice structure with a single time relaxation 
 rule is used. For obtaining a higher flexibility on the computational grid, 
 interpolation methods are applied, where the information is transferred from 
 the lattice structure to the computational grid by Lagrange interpolation. 
 The flow is investigated for different Reynolds numbers, while keeping the 
 Prandtl number at the constant value of 0.7. The results show how the 
 presence of a triangular prism effects the flow and heat transfer patterns 
 for the steady-state and unsteady-periodic flow regimes. As an assessment of 
 the accuracy of the developed Lattice Boltzmann code, the results are 
 compared with those obtained by a commercial Computational Fluid Dynamics 
 code. It is observed that the present Lattice Boltzmann code delivers results 
 that are of similar accuracy to the well-established Computational Fluid 
 Dynamics code, with much smaller computational time for the prediction of the 
 unsteady phenomena.