Rotating boundary

eros

Hello! I've to carry out a calculation in which a rotating boundary is present.The boundary moves into the fluid domain at a constant angular velocity.I set up an unsteady calculation in which boundary rotation around x axis is defined with a CEL like this:

omega = 890 [rad s^-1] alfa=omega * t sy = ((y*cos(alfa))-(z*sin(alfa)))-y sz = ((y*sin(alfa))-(z*cos(alfa)))-z

CFX solver gives me always the same error, that is: "A negative element volume has been detected..." Time step is very small (about 10^-5). I tried different meshes and different definitions for mesh stiffness but I obtained always the same result. Thank you for collaboration, bye!