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Problem in acoustic modes analysis

Problem in acoustic modes analysis

Problem in acoustic modes analysis

(OP)
Hello to everyone,

I am having problems with a eigenvalues analysis. In particular I need to extract the acoustic modes from my model.

I have created a fluid material (mat10), specifying all the properties needed, but when I run the analysis the following fatal error appears:

*** USER FATAL MESSAGE 2113 (EMG)
ELEMENT 1 REFERENCED MATID 1 WHICH CANNOT BE USED TO OBTAIN REQUIRED PROPERTIES.
User information:
A search procedure in MAT allows any possible MATi entry to be
referenced under any INFLAG. However, only certain material formats
can be used to construct the required output in /MATOUT/.
Make certain the element can reference the material entry type.

And that's for 100 element. Could anyone help me with this issue? Which material should I create?

RE: Problem in acoustic modes analysis

(OP)
Ok guys, to whom it may concern I solve the problem.

The issue lay in the PSOLID property format which did not respect what is written in the NX Nastran QRG at page 2220 (Bulk data entries -PSOLID).

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