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Showing results 1 to 7 of 7 Search took 0.00 seconds. Search: Posts Made By: flotus1

Forum: FLUENT February 8, 2013, 09:06

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 Classic...;) Classic...;)

Forum: FLUENT February 8, 2013, 05:19

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 Yes, that is what i meant in my initial post.... Yes, that is what i meant in my initial post. Pressure/pressure setups converge slower than velocity/pressure. With a velocity inlet, my setup reaches round-off accuracy after around 300 Iterations...

Forum: FLUENT February 8, 2013, 04:23

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 I tried both pressure inlet / pressure outlet and... I tried both pressure inlet / pressure outlet and a periodic boundary condition with pressure difference. Same results. Since pressure is (almost) constant in radial direction, the pressure boundary...

Forum: FLUENT February 8, 2013, 03:51

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 I just set up the case myself: Pipe... I just set up the case myself: Pipe Radius: 10^-4 m Pipe Length: 2*10-3 m Dynamic viscosity: 1*10^-3 kg/(m s) Pressure difference: 1 Pa The result is a perfect parabola for the...

Forum: FLUENT February 6, 2013, 14:19

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 I guess you are still using the pressure boundary... I guess you are still using the pressure boundary conditions. The tet mesh might be responsible for the low velocity. With a pure tet mesh, there is no need to run double precision because the...

Forum: FLUENT February 6, 2013, 11:42

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 The residuals definetly are too high for such a... The residuals definetly are too high for such a simple case. With double precision, you can get them down to ~10^-15 with a high quality mesh. So I recommend more Iterations. If this takes too...

Forum: FLUENT February 6, 2013, 09:53

Replies: 20 Cylindrical Pipe Views: 3,076 Posted By flotus1 Two pressure boundary conditions are not the... Two pressure boundary conditions are not the easiest setup to achieve convergence. I would start out with velocity inlet and pressure outlet. Set the inlet velocity to a value from which you...

Showing results 1 to 7 of 7

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