Hello,
I am running a normal modes analysis for a model that incorporates the MFLUID virtual fluid mass, and I would like to use the VMOPT method described in the NX Nastran Advanced Dynamic Analysis User's Guide to decrease memory usage and solution time. I know that I need to specify the...
Hello,
I am performing a random vibration response analysis with an input acceleration spectral density (ASD) function that has units G^2/Hz. My model uses in/s^2 as the units for acceleration, so 386.1 in/s^2 is equal to one "G". Does NX Nastran interpret the PSD function in terms of Gs, or...
Hello,
I am running a normal modes analysis for a cylindrical water tank using a MFLUID fluid region to simulate water in the tank. Because I am modeling the tank when it is full of water, I have the top, bottom and cylindrical faces selected for the fluid region and the z-free surface option...
I am running v11.0.0. I took a closer look at the help topic for MFLUID, and this part confused me:
"There is a Check box which enables you to turn the Z Free Surface OFF completely, so no value is written out to Nastran for the ZFS field. When the Z Free Surface is completely OFF and the XY...
I'm attempting to perform a normal modes analysis on a cylindrical aluminum tank filled with water. I am interested in determining the mode shapes and modal mass participation of the coupled structural/fluid response. I am attempting to model the water using a Fluid Region (fluid), but when I...
