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  1. The Lighthill stress tensor is constructed by taking derivatives of the velocity field. It is possible to build all terms of the Lighthill stress tensor within a post processing package (Fieldview, Ensight, or Paraview) by using the function calculator. To make this calculation efficient, it is suggested that the -extout flag is used on acuTrans when converting the solution to the post-processor format. This writes the velocity gradients to the file. The velocity gradients can then be assembled appropriately in the post processing package to form the Lighthill stress tensor without havin to compute each derivative in the post processor. The divergence of the Lighthill stress tensor is typically used for visualizing the acoustic source strength. Creating and animating isosurfaces of divT can provide insight into the acoustic source characteristics.
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