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Old   April 7, 2017, 10:57
Default abnormal velocity profile
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Dear Foamer,

Just, I'm trying to run the normal channel395 tutorial with pimpleFoam solver but I changed the inlet to be turbulentInlet and the outlet to be zeroGradient in 0/U file and the 0/p as well. but the problem that I got the attached velocity profile , it's supposed to be parabolic shape as I know but here it's not like that. Could you please if you know where is the problem can you tell me?

ThanksvelocityProfile.png
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Old   April 10, 2017, 05:25
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Hi,

what were the initial BC at the inlet and outlet? Normally, if you want to have a developed profile, or you use a very long channel, or you use cyclic BC
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Old   April 10, 2017, 13:50
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Hi Agustin,

my intial B.C as I wrote before for the inlet (turbulent inlet with velocity of 0.1335m/s and zeroGradient for pressure) and at the outlet (waveTransmissive for pressure and zeroGradient for velocity) both sides are cyclic.
On the other hand I need just to study the transition so no need for developed flow.

B.R
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Old   April 11, 2017, 03:07
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Hi

you would see transition after a while, at a certain distance from your inlet. Maybe your domain is not long enough, and you dont see the desired profile
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Old   April 11, 2017, 04:48
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Hi,
I think, I didn't show my problem well. The problem with me the velocity profile in the start of the laminar region at the start of the channel not after transition as I showed in the 1st . On the other hand, my channel Dimensions are taken from previous DNS study.

Thanks
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