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Old   February 5, 2016, 10:30
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yaseen
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Hellow every one, I modeled a spillway but error happen during running, as shown in attached images
http://www.cfd-online.com/Forums/att...1&d=1454682464
mesh new 2.jpg
mesh new 3.jpg
mesh new 4.jpg
mesh new 5.jpg
result.jpg
https://drive.google.com/open?id=0B3...m1FYUdZbnBySXc

Last edited by yaseen wsu; February 6, 2016 at 07:25.
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Old   February 6, 2016, 05:33
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Glenn Horrocks
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FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F

Why are you using a moving mesh on a spillway simulation? This sounds unusual.
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Old   February 6, 2016, 07:34
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dear Glenn Horrocks thanks for your reply
I dont much know about moving mesh, only I used mesh adaption in CFX in order to capture free surface because I cannot refine entire model (lack of HP computer), but in the second run I removed mesh adaption, error does not occur but the solution does not convergence is it due to mesh quality or time scale, boundary condition... (because during run between each iteration said "a wall hass been at portion of out let boundary condition (at 73 of faces)"
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Old   February 6, 2016, 21:45
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Glenn Horrocks
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There is an FAQ on the "A wall has been placed" warning as well: http://www.cfd-online.com/Wiki/Ansys...f_an_OUTLET.22

In my experience free surface models require very high mesh quality. Mesh adaption will not give you high enough mesh quality, especially if it is going a bit bezerk (as the negative volume error implies). So do not use mesh adaption.

The error you are getting on the no mesh refinement simulation is a sign of another different problem.
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Old   Today, 06:29
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Dear Glenn Horrocks thanks a lot
I re run my model by using opening BC. at outlet, but for global initialized for inlet I entered velocity in X and Y direction, my inlet opposite to the direction of x and y axis is it required to enter as negative ? or not, also I specify inlet geometry height as the depth of water.
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Old   Today, 06:35
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I do not understand your question. Can you please explain it more carefully, and post an image of what you mean.
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Old   Today, 13:38
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Quote:
Originally Posted by ghorrocks View Post
I do not understand your question. Can you please explain it more carefully, and post an image of what you mean.
thanks for your reply,
my question is that first as shown in fig. one direction of inlet opposite to the X-Y axis, so in global initialization put value of velocity (u, v) in negative or positive? as shown in figure one
another question is " during running my model only ( u.v.w, RSM and P RSM) are appear unlike picture three (means does not contain mass of water and air) as well as I used RANS eq. (mass and momentoum)" thanks
https://drive.google.com/open?id=0B3...zRudXFhYnA2Vkk
https://drive.google.com/open?id=0B3...G5ULTNURlZ1NUk
https://drive.google.com/open?id=0B3...G5pcjZBcVVPNGs
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