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-   -   Inconsistent BC results with timeVaryingMappedFixedValue (http://www.cfd-online.com/Forums/openfoam-pre-processing/121553-inconsistent-bc-results-timevaryingmappedfixedvalue.html)

McFly July 31, 2013 09:35

Inconsistent BC results with timeVaryingMappedFixedValue
 
Hello folks,

I'm simulating the 'jet in cross flow' in OpenFOAM using the icoFoam solver as a DNS solver with a fine mesh (7m cells) converted from a Fluent case file provided by my supervisor. I believe this use of icoFoam is valid, although please correct me if I'm wrong!

However, my current issue lies with the boundary conditions. I have specified a Blasius inlet condition using timeVaryingMappedFixedValue and data from the Fluent profile. A line plot is shown below and the cases align well.

https://dl.dropboxusercontent.com/u/...comparison.PNG

However, when I try the same thing for the ceiling (there is a small velocity profile through the ceiling to allow for BL development) I get completely different results - see the line plot below.

https://dl.dropboxusercontent.com/u/...comparison.PNG

I've checked a few obvious things, same profile data, same line coordinates for the plot, etc. but I'm stumped as to why the ceiling profile is out by a factor of two.

Thoughts?

Thanks,


Marty


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