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Showing results 1 to 19 of 19 Search took 0.00 seconds. Search: Posts Made By: singer1812

Forum: CFX April 10, 2012, 09:50

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 I dont understand why you are trying to force an... I dont understand why you are trying to force an outlet to have a certain gradient. Is this purely to match something in liturature? The opening will only apply those conditions to the flow...

Forum: CFX April 9, 2012, 09:02

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Ahh, I didnt read your message carefully enough. ... Ahh, I didnt read your message carefully enough. You need it on the outlet. To what purpose are you forcing the derivatives on the outlet?

Forum: CFX April 9, 2012, 08:57

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Dont need transloop. Just setup a CEL expression... Dont need transloop. Just setup a CEL expression for the derivative and put it into the BC under flow direction.

Forum: CFX April 6, 2012, 09:11

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 You are trying to get d/dx not d/dt? You... You are trying to get d/dx not d/dt? You dont need this method (update loop) to do that, that data is in already in solution.

Forum: CFX April 5, 2012, 08:51

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 What do you want to know? What do you want to know?

Forum: CFX September 14, 2011, 10:14

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 I assume you are defining it correct. You... I assume you are defining it correct. You can only monitor while the solution is running using the output monitor. Once the solution completes the additional variable will lose its delay and...

Forum: CFX September 14, 2011, 09:05

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 You cant post process these. You need to monitor... You cant post process these. You need to monitor them.

Forum: CFX June 17, 2011, 07:14

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Run a single iteration run with the AV set at a... Run a single iteration run with the AV set at a fixed number. Use that results file to initialize your new run, with the AV set back to what you want it to. I think that will fix your problem. ...

Forum: CFX June 13, 2011, 07:18

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 On the surface I don't think this is possible,... On the surface I don't think this is possible, but really haven't given it much thought. Using 2nd order difference for the derivative, you need to store the 2 previous values. If it is possible...

Forum: CFX April 6, 2011, 09:46

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Since you are using average velocity anyway, when... Since you are using average velocity anyway, when writing it to a file, do the areaAve of velocity first, assign that to a variable, and write that value out. From what you describe, it seems,...

Forum: CFX April 6, 2011, 09:44

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Well, to test out the AV way of doing it, put in... Well, to test out the AV way of doing it, put in a fixed value for delta_velocity (on the order of your expected velocity) and see if velocity rises as it should.

Forum: CFX April 6, 2011, 09:38

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 If you are using User Fortran anyway, why are you... If you are using User Fortran anyway, why are you bothering with using AV to accumulate the velocity? Do it all within Fortran.

Forum: CFX April 6, 2011, 09:35

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 You are getting it from a fortran routine that... You are getting it from a fortran routine that you are calling while CFX is running (User Fortran?) Or are you getting it from a pre-ran fortran routine, and delta_velocity is already set for the...

Forum: CFX April 6, 2011, 09:27

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Where are you getting your delta_velocity from? Where are you getting your delta_velocity from?

Forum: CFX April 5, 2011, 10:24

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Ohh, yes of course. Use one of the functions to... Ohh, yes of course. Use one of the functions to evaluate it and make it single valued.

Forum: CFX April 5, 2011, 09:28

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 I am unclear on what you are asking. I am unclear on what you are asking.

Forum: CFX April 4, 2011, 09:32

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Yes this can. But you need to initialize the... Yes this can. But you need to initialize the variable with a separate artifical run. For example if you use additional variable Q=Q+1, this will work fine except for the first iteration if Q...

Forum: CFX December 1, 2010, 09:44

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 No need to use user Fortran. As an example, edit... No need to use user Fortran. As an example, edit the additional variable in your LIBRARY with the update loop as follows: ADDITIONAL VARIABLE: OldVel Option = Definition Tensor Type =...

Forum: CFX November 30, 2010, 18:03

Replies: 103 derivative in CEL expressions Views: 20,563 Posted By singer1812 Actuallly you can get the derivative from last... Actuallly you can get the derivative from last time step to current time step via use of additional variables settings. If you create an additional variable of the velocity, and add the term using...

Showing results 1 to 19 of 19

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