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Leonardo Rosa

MFLUID as MODAL BASE for a MODAL FREQUENCY RESPONSE

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Hello,

 

I have an enclosed volume with a fluid inside.

And I have to apply an Acceleration PSD to it.

So:
1) I am using MFLUID with VMOPT 2 in order to obtain a good modal base for my analysis.

2) To simulate the pressure, I am using a PLOAD4.


I've made several tests for this Analysis to work, but my RMS Von Mises is incredibly high.

I tested:
1) Normal Modes of the Structure with and without MFLUID: all is OK and I can see a reduction of the Frequency.

2) Modal Frequency Response without MFLUID is OK: the RMS values are pretty low - around 4-6 MPa.

3) BUT the Modal Frequency Response with MFLUID gives me HUGE RMS values.
4) I checked the Eigenvector Values of the Normal Modes Analysis - with and without MFLUID. The analysis with MFLUID has numbers around 1000 times higher.

 

Question: is there some way of obtaining a good Modal Base for a Modal Response Analysis, by using the MFLUID card?

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