Recent content by dfanfan

Thanks rb1957

Yes, this error was pasted from the f06 file. Just to give you a little background information, I am taking a solid model and created midsurfaces on all the parts. I meshed all the midsurfaces and connected the panels with rigid elements. The model is about 30 thousand nodes and 30 thousand...

PLEASE HELP ANYONE!

I take that back. It didn't work. Same error but now the rank = 13848

I figured it out everyone. My model was not fully connected therefore, producing singularities. Thanks for all your help.

I am running an extensive FEMAP model and I keep getting the following errors: *** USER WARNING MESSAGE 6137 (UDSNRD) INPUT MATRIX IS RANK DEFICIENT, RANK = 12720 IERROR USER ACTION: CHECK MODEL User information: One of your matrices is singular. See the NX NASTRAN...

JAE: Figure 6.5.12.1.3 says "Tributary" Areas Greater than 700 ft^2. I thought tributary area referred to only the first surface to hit normal to the wind direction. Others: How do we account for the suction elements on the leeward face? A Ph. D at Berkeley agrees with me that MWFRS is the way...

I have a weather/sound enclosure for a piece of rooftop equipment that I am running a finite element model for 150 mph winds (Miami-Dade). The enclosure is 25 ft by 9 ft in plan and stands about 10 ft high. (Attached is a picture of my NASTRAN model) It is made of 5052 H32 aluminum and I am...