Let's see... Blender + OpenFOAM = software, but time to learn to use and develop models and run tests, understand test results, modify tests to achieve desired data, remodel, retest, etc... unless you're planning on putting your mod into full production
Or doodle and compare and use fuzzy logic until your home-brew 1 off is good enough.
I think it's a bit extreme for all the issues mentioned by ttoyoda. I'd clip it off at a point where it's close enough, but thats me.