A numerical experiment was conducted for internal comparison to compare NEK5000 and Xcompact3d code in terms of performance and accuracy. The flow over cylinder at Re=40 was choosen as the benchmark case. Along with accuracy, the effect of domain size on the accuracy of simulation was tested.
- NEK5000 - Input files for along with
.mshfiles to redo the simulations for each case and their respective runtime-log file. - Xcompact3d - Input files
.i3dfile to redo the simulation for each case and their respective runtime-log file.
From the above comparison, we observe that NEK5000 simulations are more efficient and accurate in comparison to the Xcompact3D simulations. The accuracy of the NEK5000 simulations can be improved further by increasing the number of elements near the cylinder body while keeping the domain big enough such that the far-field boundary condition is achieved. NEK5000 simulations allow mesh refinement in all directions unlike Xcompact3D and hence require less number of elements to achieve much better accuracy.
