June 19, 2020 at 5:35 pmjavierbravo9Subscriber
I'm working on FSI project. I've just read a paper that suggests using FLUID220 as 3D acoustic fluid. I have reviewed that my program is using FLUID221. I don't know well how to change it so I came here for some help. I'm using Modal acoustic for this work.
June 19, 2020 at 7:07 pmHuiLiuAnsys Employee
Both fluid220 (hex) and 221 (tet) are used for acoustics, so it is correct.
June 21, 2020 at 2:18 amjavierbravo9Subscriber
Is there a big difference between both fluid models? I know that both have quadratic pressure behavior. I wanted to try with both to see if I get difference answers. So I was wondering If there is a way to change fluid221 to fluid220.
June 21, 2020 at 3:41 pmpeteroznewmanSubscriber
Your mesh has quadratic tet elements. You have to mesh with quadratic hex elements to use fluid220. That means delete your mesh and insert a mesh control Method = Sweep.
First you should right click on the Mesh item in the outline and Show Sweepable bodies. If the body does not highlight in green, then you need to try Method = Multizone. If that mesh fails, go back to Geometry and in SpaceClaim, (or DesignModeler) split the body until you have a collection of six sided pieces, then use the Share button on the Workbench tab to create Shared Topology. That will then take a Sweep method.
June 22, 2020 at 12:01 amjavierbravo9Subscriber
Thank you so much, it worked well.
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