Accuracy RapidCFD vs. OpenFOAM
 

Hey :)


I recently started working with RapidCFD. My first test case is a straight pipe (domain: D= 0.1 m, length 10 m; mesh: hexahedral O-grid, y+~1, ~10 mio. cells; incompressible, kOmega turbulence model). My aim was to test the performance of RapidCFD and compare the results to OpenFOAM (Version 2.3.1), analytical data and experimental data.

As expected, I gained a great speed-up using GPU, but unfortunately my results are less accurate compared to OpenFOAM. Using the same set up (exception: linear solvers, because AINV is not available in OpenFOAM) the calculated pressure drop is underestimated by RapidCFD compared to OpenFOAM and the velocity profile is less steep (both underestimate the analytical data (know ‘problem’ of simulation results)).


EDIT: Convergence behavior is quite similar for RapidCFD and OpenFOAM


Does anyone else noticed a difference in simulation results (RapidCFD – OpenFOAM 2.3.1) Could it be the influence of the linear solver or am I missing something?


Thanks for help!


Ann-Kathrin