Hello everyone
Im new to CFD in general, and unsure about the right boundary conditions for external flow .
Im trying to simulate a bullet, but what should the right BC be for top/bottom and sides of the domain?
Would symmetry or free-stream BC be the way to do it?
Hope anyone has a good answer
/Frederik
Hey @Frederik2308
You can try moving wall for the ground (same velocity and same direction as the bullet) and symmetry or slip walls for top/sides.
/Ric
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Thanks Ric
How come free-stream isnt the right configuration?
To my knowledge SolidWorks flow uses free-stream as BC in external studies
/Frederik
It should also work . Freestream BC for velocity works more or less like inlet-outlet. For each boundary cell, velocity will either be fixed value (if the vector points into the domain) or zerogradient (if it points out).