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Forum: Main CFD Forum

January 7, 2013, 10:49

Replies: 11

Pipe flow developing too quickly

Views: 1,256

Posted By FMDenaro

I have no other idea than checking for some bug...

I have no other idea than checking for some bug in the input data... maybe somehow the value of the Re number is fixed to a small value...check also for the divergence of the velocity if is zero...

Forum: Main CFD Forum

January 7, 2013, 08:00

Replies: 11

Pipe flow developing too quickly

Views: 1,256

Posted By FMDenaro

Assuming that the code has no bug, what about the...

Assuming that the code has no bug, what about the grid sizes and discretization of the convective terms? If your grid is too coarse and you are using first order upwind, maybe you have so much...

Forum: Main CFD Forum

January 7, 2013, 07:41

Replies: 11

Pipe flow developing too quickly

Views: 1,256

Posted By FMDenaro

of course something wrong must be in the code......

of course something wrong must be in the code... check in the code the actual value used for the Re number, try also if Re=500 gives you again the same x/D value ... what about the outflow BC?

Forum: Main CFD Forum

January 7, 2013, 06:43

Replies: 11

Pipe flow developing too quickly

Views: 1,256

Posted By FMDenaro

you get the same lenght x/D both at Re=10 and...

you get the same lenght x/D both at Re=10 and Re=100? Are you sure that the solution corresponds to the analytical parabolic velocity profile?

Forum: Main CFD Forum

January 7, 2013, 05:36

Replies: 11

Pipe flow developing too quickly

Views: 1,256

Posted By FMDenaro

what about your Reynolds number?

what about your Reynolds number?

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