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What is going on here?

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Old   May 2, 2011, 23:00
Default What is going on here?
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David Gaden
Join Date: Apr 2009
Location: Winnipeg, Canada
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marupio is on a distinguished road
This is a simple scalarTransportFoam test.

When I reduce the timestep, the scalar "freezes" prematurely. The smaller the timestep, the earlier the "freeze". See the attached pictures. Could I be running into machine epsilon problems?

This is a .1 meter square cavity with uniform flow from the left at 1.45e-8 m/s. The scalar is fixed value at 70 on the left side, so the attached graphs should level off around there.

The mesh is very simple - a 4x4 2-d grid.

Any insights as to what's going on?
Attached Images
File Type: png 10sTimestep.png (4.3 KB, 17 views)
File Type: png 25secondTimeStep.png (4.3 KB, 16 views)
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