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#1 |
Member
Jimmy
Join Date: Sep 2016
Location: Japan
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Hi, I am Jimmy. I would like to make a simulation for membrane separations. Concentration near the membrane surface should be cleared. I have read many papers about this. CFX as a powerful tool was used in their simulation. But I still can not understand some basic methods. Give me some suggestions or tips in your similar simulation or answer two question.
1)How to input partial differential equations like listed in fig? 2)What is the difference between inlet boundary and source? Thank you very much! |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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1) Look in the CFX Reference manual, the section on CEL variables. You will find you can calculate gradients and other functions of variables which should allow you to enter the equation you show.
2) An inlet boundary is a boundary which has been defined as an inlet. It does not change the equations, just applies the boundary condition. A source term is a change to the equations where a source term is added. Source terms are very flexible and can be made to do all sorts of things, but you will need to work out the mathematics of how to do it.
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#3 |
Member
Jimmy
Join Date: Sep 2016
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Thank you very much for your reply, but unfortunately, I still can not understand your explanation. Can you me some materials example or book? I really need to know how to realize them in details. For example, what the different of source setting and inlet setting, and how to set mass source?
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#4 | |
Member
Jimmy
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Location: Japan
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I think I found the book you mentioned, but I havent found the section about gradient function. I will try, thank you for your kindness.
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#5 |
Super Moderator
Glenn Horrocks
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Look in the section on CEL variables, as I said previously.
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#6 |
Member
Jimmy
Join Date: Sep 2016
Location: Japan
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I have read the part of the manual, but I still can not understand how to input concentration gradient and the equation. The part you mentioned is '14. CFX Expression Language(CEL)' or '16.Variables in ANSYS CFX', there is no information about partial derivative and gradient. I have tried to search for these keywords in the whole manual, I got nothing. Help me, please, I really need your suggestion.
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#7 |
Super Moderator
Glenn Horrocks
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#8 | |
Member
Jimmy
Join Date: Sep 2016
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Thank you very very much! I will try.
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