Why isn't MatPIV fit for non-Newtonian fluids?

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The discussion centers on the challenges faced while using the MatPIV Matlab toolkit for analyzing flow in viscoplastic media. Users expected to identify yielded and unyielded regions but found that MatPIV indicated uniform flow throughout the area, which contradicts visual observations showing flow only near moving inclusions. The thread seeks assistance from those familiar with MatPIV to explain this discrepancy and suggest potential workarounds. Additionally, there is a consideration to link the discussion to the mechanical engineering section for broader insights.
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We are using the MatPIV Matlab toolkit:
http://www.math.uio.no/~jks/matpiv/

However, we are having trouble using the toolkit with viscoplastic media. It was expected to find a yielded region and a unyielded region, however, from the results of MatPIV it appeared that the whole area was flowing. This contradicts visual inspection of the system with tracers, in which flow was apparent only near moving inclusions. Is anyone familiar with MatPIV that might help us explain and possibly work around the problem? Thanks!
 
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Mods: On second thought, this _might_ belong in the mechanical engineering section. Is it possible to soft-link there as well? Thanks!
 
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