Error MessageModel does not Product an Integer Symmetric Pattern

Issue:

The following error message is issued for a radiation analysis that has symmetry boundary conditions: 

Error: The model does not produce an integer symmetric pattern

Solution:

Solution

This error happens when the angle subtended by the model does not produce an integer number of objects when the slice is "revolved" 360 degrees. 

For example:

A 21 degree wedge is built and the appropriate faces are assigned with symmetry boundary conditions.

The following calculation is performed: 

number of pieces = 360 / 21 = 17.1429 

The 0.1429 fractional piece will cause this error. 

The correct way would be to use a 20 degree angle. The calculation would be 360/20 = 18 pieces. 

The number of pieces is important, since Autodesk® Simulation CFD actually creates the virtual pieces and deals with the entire geometry to correctly model internal shadowing. 

To resolve this issue: 

Modify the geometry in the CAD tool to ensure that it sweeps an angle that is a factor of 360.

 

Products:

Simulation CFD

Versions:

2010;2011;2012;2013;2014

Discuss