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Hybrid Meshing Key to Improving CFD Simulation Efficiency
Posted Tue February 05, 2019 @05:14PM
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News When most people think about efficiency in completing a task, they think about speed. But when CFD (computational fluid dynamics) engineers think about efficiency, they understand there is a vital second component solution accuracy.

Pointwise has published the case study Hybrid Meshing Key to Improving CFD Simulation Efficiency wherein various meshing approaches are compared to determine the most efficient simulation.

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A CFD simulation solution achieved quickly is not efficient if it is not accurate. It is the much-sought-after combination of speed and accuracy that results in true efficiency.

Determining how CFD engineers can best improve simulation efficiency is the focus of A Study on the Influence of Meshing Strategies on CFD Simulation Efficiency, a heavily-illustrated 39-page conference paper co-authored by Travis Carrigan, manager of technical sales at Fort Worth, Texas-based Pointwise, Inc. The paper was presented at the 2017 NAFEMS World Congress.

hybrid mesh
A hybrid hexahedral/tetrahedral mesh on the Potsdam Propeller Test Case.

For the paper, Carrigan and co-author Faranggis Bagheri, managing director at neptech, generated CFD solutions for computing the torque and thrust coefficients of the benchmark Potsdam Propeller Test Case (PPTC) geometry -- a highly three-dimensional, variable pitch propeller consisting of five blades. Both hybrid and multi-block structured overset meshes were generated to achieve the CFD solutions. The result was that a hybrid mesh could be generated and a CFD solution achieved in little more than 2.5 hours, whereas a multi-block structured overset mesh and resulting solution took more than 33 hours. Furthermore, the hybrid solution was more accurate.

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