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Thanks for your reply, hacksaw. I might not make my question clear. The boundary mentioned in the question is actually the outer boundary of the fluid. By adding an impedance boundary condition on that boundary, the wave could pass from the infinite acoustic domain into the computational domain...

Dear all, I want to simulate the propagation of an acoustic wave with a spherical wave source outside my computational domain using Finite Element Method. The governing equation is a linearized acoustic equation with velocity potential as the primary variable ( the secondary variable is thus...

Thank you very much whitwas! Your explanation is very clear and helpful.

Dear all, I'm just starting off in the field of FEM. Please bear with me if this is a bad question. I'm curious how do we model rigid body motion in FEM. The first way I can think of is to discard the stiffness term totally (set stiffness matrix to 0). That way, the equation of motion becomes...

Dear all, I'm trying to create a 3D mesh in abaqus using hex element with non-uniformly spaced interpolation nodes.(e.g. Gauss-Lobatto interpolation points) However, there are no such element topology in element library. I've read the "User subroutine to define an element" chapter in user guide...