# HELP TIME on FLUENT

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 May 12, 2012, 17:26 HELP TIME on FLUENT #1 New Member   slim Join Date: Apr 2012 Posts: 18 Rep Power: 7 Sponsored Links hello, I simulated a fluid flow in a straight pipe with ANSYS Fluent : Inlet velocity : 0.116 m/s Outlet pressure 400 Pa with mass flow rate 0.063 kg/s Time step size: 60 seconds Number of time step: 5 Number of iterations / time step: 300 I find the same result I noticed that the solver resolves five blocks of 300 iterations each time, is it recalculates every time? 60 seconds is enough or must I fix a few minutes thank you very much

May 12, 2012, 18:37
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Quote:
 Originally Posted by slimmsk hello, I simulated a fluid flow in a straight pipe with ANSYS Fluent : Inlet velocity : 0.116 m/s Outlet pressure 400 Pa with mass flow rate 0.063 kg/s Time step size: 60 seconds Number of time step: 5 Number of iterations / time step: 300 I find the same result I noticed that the solver resolves five blocks of 300 iterations each time, is it recalculates every time? 60 seconds is enough or must I fix a few minutes thank you very much
it will solve 300 iterations at the current time, then move to the next time-step and do another 300 iterations until 5 time-steps have been solved.

isn't this a steady problem? none of your boundary conditions appear to be transient, your simulation will be steady even if you run a transient simulation.

 May 13, 2012, 05:04 #3 New Member   slim Join Date: Apr 2012 Posts: 18 Rep Power: 7 hello, I try to simulate flow between two cylinders. Normally I should get a constant velocity profile along the length (figure 1). Fig 1.gif But, I found an acceleration along the entire length of the cylinder (figure 2). Fig 2.gif Change speed / length axis> 0 normally it must be = 0 I can not find the trick. Is that it's normal? thank you

 Tags cfd, flow, fluent, pipe flow, time

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