Text command discretization

Maxime31850 · May 7, 2013, 11:43

Hey everyone,

I was introduced to fluent a few weeks ago. I'd like to run some simulation during the night with a k-epsilon turbulence model. I need to change the discretization order from "first order upwind" to "second order upwind" for the momentum, turbulent kinetic energy and turbulent dissipation rate after a few hundreds iterations. I've seen the differents text commands in google but I don't know how to use them. Do you have any ideas of a macro I could use ?

Thanks a lot

blackmask · May 7, 2013, 20:01

A very simple example. Suppose you have a case named "hi.cas". You have everything set but the discretization scheme. You want to initialize the flow, change the discretization to higher order, and iterate for, say 2000 iterations. You should create a file named "whatever.jou", and put the following contents in this file.

;; contents of whatever.jou
/file/set-batch-options no yes no

/file/read-case hi
/solve/initialize/initialize-flow

;; the next line uses "Second Order Upwind" to the momentum equation
/solve/set/discretization-scheme/mom 1

/solve/iterate 2000

/file/write-case-data hello

exit
;; end of whatever.jou

Then you could use the command line
fluent 3ddp -t4 -i whatever.jou
or run from GUI.

May 7, 2013, 11:43	Text command discretization	#1
Maxime31850 New Member Maxime Join Date: Apr 2013 Posts: 5 Rep Power: 13	Hey everyone, I was introduced to fluent a few weeks ago. I'd like to run some simulation during the night with a k-epsilon turbulence model. I need to change the discretization order from "first order upwind" to "second order upwind" for the momentum, turbulent kinetic energy and turbulent dissipation rate after a few hundreds iterations. I've seen the differents text commands in google but I don't know how to use them. Do you have any ideas of a macro I could use ? Thanks a lot

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May 7, 2013, 20:01		#2
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 21	A very simple example. Suppose you have a case named "hi.cas". You have everything set but the discretization scheme. You want to initialize the flow, change the discretization to higher order, and iterate for, say 2000 iterations. You should create a file named "whatever.jou", and put the following contents in this file. ;; contents of whatever.jou /file/set-batch-options no yes no /file/read-case hi /solve/initialize/initialize-flow ;; the next line uses "Second Order Upwind" to the momentum equation /solve/set/discretization-scheme/mom 1 /solve/iterate 2000 /file/write-case-data hello exit ;; end of whatever.jou Then you could use the command line fluent 3ddp -t4 -i whatever.jou or run from GUI.