Accuracy of drag prediction on bluff bodies using CFD

摘要

A calculation method based on k-ε turbulence mode and log-law wall function is considered the most useful method for practical calculation, because calculation time is shorter than other methods such as pseudo direct simulation. However, in order to obtain appropriate re- sults, the grid configuration must be carefully chosen depending on the presence or absence of separation. For an actual vehicle, it is often difficult to judge whether separation occurs or not before calculation (making grid), which paradoxically speaking is the purpose of calculation.