Simcenter 3D Solutions How to define Pressure release boundary condition (P = 0) in SC3D Nastran Acoustic SOL 103?

2022-07-18T21:18:33.000-0400
Simcenter Nastran

Summary

Setup Pressure release boundary condition (P = 0) in Nastran SOL 103

Details

In Simcenter 3D, the acoustic mode solution only support boundary conditions V=0 (default everywhere).  Pressure P=0 is not supported in the SC3D graphic user interface.  However, the boundary condition P=0 is supported in the Nastran solver.  Just solve the modal solution using option “Write Edit & Solve Input File”, this allows you to edit the input file first before solving.  Add the following lines to the input file:

image.png
 
  1. Under subcase, add ALOAD=1

SUBCASE 1
  LABEL = Subcase - Eigenvalue Method 1
  METHOD(FLUID) = 201
  ALOAD = 1
  1. At the end (before ENDDATA), Add the following (the number 16, 32,… are the face IDs where you specified P=0).

ACPRESS        1    REAL1.000000  0.0000  0.0000                      16+
+             32      48      64      80      96     112     128     144+
+            160     176     192     208     224     240     256     272+
+            288
ENDDATA

When finished editing, save the file and submit the job.

 

KB Article ID# KB000050241_EN_US

Contents

SummaryDetails

Associated Components

Other SOL101 SOL103 SOL105 SOL106 SOL107 SOL108 SOL109 SOL110 SOL111-SOL112 SOL144 SOL145 SOL146 SOL153 SOL159 SOL200 SOL401 SOL402 SOL414 SOL601-SOL701 Superelement