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VELOCITY vs VELOCITY IN STN FRAME vs RELATIVE VELOCITY |
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July 13, 2015, 07:07 |
VELOCITY vs VELOCITY IN STN FRAME vs RELATIVE VELOCITY
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#1 |
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everest
Join Date: Mar 2014
Posts: 3
Rep Power: 12 |
Hi guys,
In FLUENT we have option to display VELOCITY MAGNITUDE and RELATIVE VELOCITY MAGNITUDE, while in CFD-POST there is additionally VELOCITY IN STN FRAME. Here's short dscription of my test-case model.
In Fluent documentation regarding MFR the ABSOLUTE VELOCITY is defined as . Where is the relative velocity and is the translational velocity, note that there is no rotational motion in my case. I accept this definition however I cannot understand how Fluent understands VELOCITY MAGNITUDE in case of of MRF. Thanks in advance for any help |
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July 13, 2015, 09:35 |
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#2 |
New Member
everest
Join Date: Mar 2014
Posts: 3
Rep Power: 12 |
OK! So I was actually wrong about the difference in VELOCITY IN STN FRMAE (cfd-post) and VELOCITY MAGNITUDE (fluent) - both look alike and are different between the two analysed cases.
However there is still a question: why there is a difference between velocities in both cases. See the attached figure which presents y-velocity, As we can see the behavior of the flow is different? Once again thanks in advance for any help, and sorry for the previous confusion between VELOCITY (fluent) and VELOCITY IN STN FRAME (cfd-post). |
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