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September 21, 2005, 09:10 |
Wind profile
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#1 |
Guest
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Hi all,
I am using the wind profile in v3.6.1 It works fine! However there is a slight problem in that the profile changes slightly as it moves through the domain (problem with all codes). Now the change isn't a whole lot and i'm being very pedantic about this but i would really like the flow to remain stable. In the CFX forum a person suggested that: "Maintaining a constant profile can be tricky and a constant problem. Some codes allow a feedback mechanism to perpetuate the flow through the model. What happends is that you specify an inlet condition - your profile, and then at the out let you feed back the outlet flow profile back into the inlet. This constant loop ensures that the result reaches a stable profile for a given inlet condition. This can then be input into the final model for a gived roughness and there should be no change in profile conditions throughout the model." Can I do this with Phoenics? Thanks for any help! |
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September 21, 2005, 13:28 |
Re: Wind profile
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#2 |
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It seems to me that if the boundary conditons are set up correctly, and the internal numerics are consistent, then the inlet boundary-layer profile should be replicated throughout the solution domain. Library Case T306 does a fairly good job of preserving the velocity profile from inlet to outlet in the y-z solution plane.
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September 28, 2005, 11:51 |
Re: Wind profile
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#3 |
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Yes, this sounds like an xcycle type principal. If you have a compilable version you could this up within the file ground.for group 13 and from the Q1 use a user_defined inlet condition. However to my knowledge it is not set up as a standard front end click on thing in PHOENICS.
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