Fluid pressure penetration is a path-dependent loading. Therefore, you should define the "starting points" with great care. In many cases, you might need to remove invalid default starting points and properly define the physical location of the fluid penetration loading. For more information, see Specifying Fluid Penetration Starting Points in the Contact Technology Guide.

You should be careful not to apply fluid pressures multiple times when contact pairs overlap. Duplicate fluid penetration loads should be removed as demonstrated in Boundary Conditions and Loading.

Determining an appropriate stabilization constant (STABILIZE command) may require some experimentation. The defined constant should be large enough to prevent rigid body motion, but also ensure that the resulting stabilization energy is much smaller than the strain energy. Trial and error is often required to obtain a suitable value.