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an error in defination for fluid models |
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February 11, 2017, 23:30 |
an error in defination for fluid models
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#1 |
New Member
Jiacheng Wang
Join Date: Feb 2017
Posts: 11
Rep Power: 9 |
Hello everyone,
I am trying to model a simple membrane module with CFX. My current problem is an error when I define two gas materials. The error message said that one constraint component is required for the component fluid models. However, I can not find any positions to fill in the 'fluid models' page for the default domain. I defined the option for heat transfer to be isothermal at 378K and defined the option for turbulence to be k-Epsilon. None for combustion and none for thermal radiation. Also, the options for two materials(C2H6O & H2O) both is transport equation. That's all what I have set. I'm a new one in CFX. Hope for help and I would appreciate that very much. jackeyson |
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February 13, 2017, 14:53 |
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#2 |
Senior Member
Join Date: Jun 2009
Posts: 1,811
Rep Power: 32 |
One of your transport equation settings should be "Constrain"
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February 13, 2017, 20:09 |
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#3 |
New Member
Jiacheng Wang
Join Date: Feb 2017
Posts: 11
Rep Power: 9 |
Just as you have said, it was solved.
Thanks a lot. |
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April 10, 2018, 02:00 |
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#4 |
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naman doshi
Join Date: Oct 2017
Posts: 35
Rep Power: 8 |
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April 10, 2018, 02:01 |
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#5 |
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naman doshi
Join Date: Oct 2017
Posts: 35
Rep Power: 8 |
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January 29, 2021, 04:39 |
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#6 |
New Member
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So can anyone share how to solve this issue? In my case, I have Nitrogen/Steam in the system, where the domain initially is filled with Nitrogen and then Nitrogen/Steam mixture enters.
I get an error: "In Analysis 'Flow Analysis 1' - Domain 'Default Domain': One constraint component is required for the component fluid models." However, if in "Fluid Models", either Nitrogen or Steam option from "Transport Equation" is changed to "Constraint", then I get the following error: "The object "/FLOW:Flow Analysis 1/DOMAINefault Domain/BOUNDARY:inlet/BOUNDARY CONDITIONS" contains the following object: "Steam" whose name is not in the set of those allowed: "Nitrogen"." So at the end, if one of the components is "Constraint" I lose the possibility to use that component in the system. Could anyone advice? Thanks. |
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January 29, 2021, 06:05 |
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#7 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,835
Rep Power: 27 |
You should have set it as follows:
- You define a varaible composition mixture with N2 and H2O - In the domain select the mixture as fluid. - Then you select to either solve N2 or H2O. So one component has a mass fraction x and the other will be 1-x. - At the initial conditions, you can set the value for x - And at the inlet as well. It it does not work like that, I would start over again. Or define a new variable composition mixture. You mention steam. What do you mean with steam? Is it just water vapour? Or is it wet steam? |
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