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User-defined subroutines in Fluent 6

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Old   January 7, 2005, 08:59
Default User-defined subroutines in Fluent 6
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Razvan
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Hy everyone. I am using Fluent 6.1 and i try to modelise a plasma reactor. I am interested by the flow and chimical reactions modelling. In such a reactor some volumetric chemical reactions take place only in a particular volume of the reactor. I want to modelize the entire reactor while taking into account these reactions just in a part of it. How can I do this?
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Old   January 7, 2005, 10:24
Default Re: User-defined subroutines in Fluent 6
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Andrew Garrard
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I don't really know what a plasma reactor is, but it reminds me of an article that I read:

http://www.fluent.com/about/news/new...2v11i2/a15.htm

Hope this might help you out.
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Old   January 10, 2005, 11:11
Default Re: User-defined subroutines in Fluent 6
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Ionut
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Thank you Andrew for your answer but this article consider that the chemical reactions take place in all the reactor. Actually I need to "tell" fluent that the chemical reactions take place only in a particular volume of modelized domain. I think one of the solution is to use User Defined Subroutines (UDS) but it seems that, in Fluent 6, UDS are not available. Thank you once again!
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Old   January 10, 2005, 11:18
Default Re: User-defined subroutines in Fluent 6
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Andrew Garrard
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Ah, OK, right, UDF's (User defined fuctions) are definatly avaliable in fluent 6, as I am alot of other, far more competant, members of this forum use them all the time. Fluent 6 comes wiht a specific UDF manual. You can specify volumetric reaction rate and surface reaction rate any way you want using these subroutines. Get the manual and check out 4.3.14 DEFINE_VR_RATE.

good luck
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Old   January 10, 2005, 17:39
Default Re: User-defined subroutines in Fluent 6
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Francisco
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Razvan:

The zone of interest within the reactor needs to be singled out within the model. The cells of interest and the particular chemical reaction need to be specified within a subroutine. You need to define all the i, j, k locations and ranges within the model. I am not aware that you can do this with an UDF. I know that you could compile the subroutine made in Fortran or C and have Fluent execute after your compilation. A special way of starting Fluent is needed. For this you need the help of your local Fluent advisor and have all the computer-software tools to do it.

Francisco
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Old   January 11, 2005, 06:09
Default Re: User-defined subroutines in Fluent 6
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Andrew Garrard
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I haven't done this in a while, so I had to check back over the manual. The function is passed values of the cell and cell thread as arguments, so if you want to create a reaction on a particular section of the cell thread simply put in a conditional clause based on the cell's geometrical loaction. You do not need to include a cell loop by the looks of things - so the funciton must be called with a cell loop in Fluent.
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