Problems with generating mesh in workbench

[zcemwmz]

Hi,

I'm solving a ultrasound related 3D model with harmonic acoustic analysis over a range of frequencies. I generated input files (.dat) in the workbench, and ran ansys Mechanical on a cluster to get the result. This works alright when I'm testing relatively low frequencies. When I increased the frequency to ~2 MHz, it seem to be impossible to generate the mesh in my local PC due to the small element size required. Is there a way to generate the mesh on the cluster instead? Or is there any other methods/parameters that I should try in meshing?

The setting for the mesh that I'm using is: element per wavelength = 10 (all bodies), all other settings were by default.

Geometry size: 5mm x10mm x10mm plus a 1mm thick PML layer

Thank you so much!

[Rob]

Are you running Mechanical for the acoustics? 

[zcemwmz]

Hi Rob,

I set up the boundary conditions and generate meshing in workbench, then run the acoustic simulation on Mechanical APDL in a cluster.

[Rob]

OK, so not Fluent or CFX. You'll be better served putting your question into Structures as the fluids section covers the CFD codes and what we do is a little different! 

[zcemwmz]

Thank you for your reply Rob. Do you mean setting up the problem under the harmonic response instead? But wouldn't it still use Mechanical APDL as the solver? Would switching to sturctures reduce the computational resources needed for the meshing?

Also, I'm using an acoustic excitation as a load to get the pressure and displacement at the fluid-solid interface, can I still do that with structual analysis?

[Rob]

CFD - Computational Fluid Dynamics. The Structures team look after the solid bendy stuff - hence you may get a better answer in here https://innovationspace.ansys.com/forum/forums/forum/discuss-simulation/structures/