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February 8, 2024, 06:29 |
the maximum edge length of local grid in CFX
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#1 |
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夏锦霞
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In the Ansys CFX model, how to obtain the variable of the maximum edge length of local grid if it is needed in the model modification.
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February 9, 2024, 18:32 |
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#2 |
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Glenn Horrocks
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Location: Sydney, Australia
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You can get mesh statistics and define new variable fields which have mesh quality measures in CFD-Post on the calculator tab. Run the mesh calculator and the new variables will be generated.
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February 12, 2024, 22:30 |
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#3 |
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夏锦霞
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Can I get the variable with mesh statistics like maximum edge length of local grid in CFD-Pre?
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February 12, 2024, 22:49 |
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#4 |
Super Moderator
Glenn Horrocks
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You cannot do it in Pre. From pre save a .cfx or .def file, load it into CFD-Post and you can calculate the mesh statistics.
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February 12, 2024, 23:14 |
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#5 |
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夏锦霞
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I have to get variable with mesh statistics like maximum edge length of local grid to modify the tubulence model,but i do not know how to define or get it.
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February 12, 2024, 23:31 |
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#6 |
Super Moderator
Glenn Horrocks
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Have a look at the length variable. I am not sure which element length it contains but it might be useful.
But on a more fundamental level - any turbulence model which requires the mesh edge length as an input means it is probably not mesh independent. You would think a turbulence model should only have physical parameters as inputs.
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February 13, 2024, 22:51 |
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#7 |
New Member
夏锦霞
Join Date: Mar 2023
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In CFX,Δmax is the maximum edge length of the local computational cell within DES models.How can i get the defined Δmax in CFX?
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February 14, 2024, 00:14 |
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#8 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,841
Rep Power: 144 |
You will need to activate the DES model for that to be available.
Have you looked at the "Mesh Length Scale" variable? I am not sure exactly what length it reports but it might be useful. There is also the volume of the finite volumes. You could take the cube root of this to get a mesh length scale. This is variable "Volume of Finite Volumes".
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