# Temperature profile of a cylindrical wall in CFX

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July 13, 2011, 09:29
Temperature profile of a cylindrical wall in CFX
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Hamed
Join Date: Oct 2009
Posts: 64
Rep Power: 9
Dear friends,
In fact I want to use a special temperature profile at a cylindrical wall in CFX (as shown in attached file). Can any body help me please to do that ? in there any tutorial or document ?

Sincerely
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 July 13, 2011, 11:32 #2 Member   Join Date: Nov 2009 Posts: 49 Rep Power: 9 Hi It is easy to define the temperature variation vs a distance by using a function in CFX-Pre.

 July 13, 2011, 12:08 Temperature Profile #3 Member   Hamed Join Date: Oct 2009 Posts: 64 Rep Power: 9 Dear Abou Ali, Thank you very much, but my problem is that the wall is rounded and not straight, have you any document to send me please ?

 July 13, 2011, 12:32 #4 Member   Join Date: Nov 2009 Posts: 49 Rep Power: 9 Hi, If you need documentation about CFX-Pre Function you can find it in the CFX Help. You can see also tutorial 19 Air Conditioning Simulation (CFX 13).

 July 15, 2011, 04:58 CFX Tutorial #5 Member   Alireza Safikhani Join Date: Dec 2010 Posts: 36 Rep Power: 8 There are some exampls in the cfX tutorial about functions. you can use them.

 July 20, 2011, 01:04 #6 Member   Hamed Join Date: Oct 2009 Posts: 64 Rep Power: 9 Dear Abou Ali In fact I read the mentioned tutorial, but in that example show using the functions in CFX but has not explain how can write a function. Do you know how can I write a function to show for example a linear temperature profile ? Sincerely

 July 21, 2011, 08:20 #7 Member   Join Date: Nov 2009 Posts: 49 Rep Power: 9 Hi, This is the procedure to create and use a function in CFX Pre. The function is T=f(x) and the known data are: T1 at x1 T2 at x2 T3 at x3 The units of T and x are K and m respectively Procedure 1- From the main menu, select Insert > Expressions, Functions and Variables > User Function. 2- In the New Function dialog box, type Tempx. 3- Click OK. The details view for the Tempx function is displayed. 4- In the Argument Units box type [m] 5- In the Result Units box type [K] 6- Set Option to One Dimensional 7- In the Coordinate box type x1 8- In the Value box type T1 9- Click Add 10- Repeat steps 7 to 9 to add x2,T2 and x3,T3. 11-Click OK ***************** From the main menu, select Insert > Expressions, Functions and Variables > Expression. 2. In the New Expression dialog box, type Tx. 3. Click OK. The details view for the Tupper equation is displayed. 4. Under Definition, type Tempx(x) . 5. Click Apply to create the expression. The expression is added to the list of existing expressions. perchou likes this.

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