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Meshing problem --> Thermo failure

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Old   April 8, 2013, 10:59
Default Meshing problem --> Thermo failure
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Hello everyone,

I am trying to simulate maximum flow inside a tiny pipe using totalPressure = 106325 Pa boundary and fixedPressure=101325 Pa.
Dimensions of pipe is (0.004 m length and 0.003 mm diameter)

Using a very coarse netgen mesh and about 15000 iterations, a fully converged solution is obtained.
However, when refine the mesh, a solution cannot be obtained due to failure in the thermophyical- or the pressure model.

Anyone having ideas why the refined mesh cannot converge. Pictures are attached, 'fine2' is the fine mesh and 'coarse' is the coarse mesh.

Attached Images
File Type: jpg fine2.JPG (95.5 KB, 6 views)
File Type: jpg coarse.JPG (75.3 KB, 4 views)
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