Input Parameters in Fluent Standalone

ishan_ae · April 11, 2018, 13:10

Hello,

I have always wondered what is the use of input parameter when Fluent stand alone( with no connection to Workbench) is used. It has the option of defining a parameter that can be done easily.
However, how do you actually control the parameter value especially if you want to loop over that I/P parameter over multiple values ?
Is there any way one can acess this defined parameter value in TUI ?

For example, let's say that I want to see the effect of inlet flow velocities on a pipe of certain length. To ideally do this, I will define velocity inlet parameter in Fluent(standalone) and enter multiple values so Fluent solves for each individual value. How would I go forward with this ?

One idea(rather a complicated one) is to acess the name of the defined I/P parameter. Once the name of the parameter or its ID has been acessed, it's value an be looped using a 'do' loop in Scheme.
Something like this:-

Code:

 

(do ((parameter start_value ( + parameter increment_value))) ((> x end_value))

(ti-menu-load-string ( format #f "set the parameter value" x)) ; HOW WOULD YOU THE SET THE VALUE 

(ti-menu-load-string (format #f"solve/iterate 10")) ;SOLVE THE SOLUTION WITH THE NEW PARAMETER VALUE

)

Also, I am using Fluent 17.0

LuckyTran · April 11, 2018, 16:55

In standalone Fluent, it's better to use the TUI commands rather that use the WB scripting language.

If you insist on using parameters you would update a parameter by using:

Code:

/define/parameters/edit "nameofParameter" newValue

The parameter option just gives you a convenient variable to assign as a BC. Really you could just edit the BC's manually in a Fluent .jou and not deal with any parameters. For example this would set the inlet velocity magnitude on a boundary called myInlet to 10 m/s.

Code:

/define/boundary-conditions velocity-inlet myInlet () vmag no 10

Please don't copy and paste this into your .jou because chances are, your case setup is different than mine and needs different inputs. I highly recommend to get familiar with entering text commands in to the Fluent interface. But you can see the commands to update a parameter and change a BC is not very different and doing either requires you to learn how to use the TUI.

ishan_ae · April 12, 2018, 09:39

Yes. I was thinking the same. A while later I realized that there would not be much of a difference if I looped the BC settings or the parameter values. I will go with looping the parameters since that seems a much striaghtforward way to do. Also, the command for editing the I/P parameters is not long.

April 11, 2018, 13:10	Input Parameters in Fluent Standalone	#1
ishan_ae Member ishan Join Date: Oct 2017 Posts: 78 Rep Power: 9	Hello, I have always wondered what is the use of input parameter when Fluent stand alone( with no connection to Workbench) is used. It has the option of defining a parameter that can be done easily. However, how do you actually control the parameter value especially if you want to loop over that I/P parameter over multiple values ? Is there any way one can acess this defined parameter value in TUI ? For example, let's say that I want to see the effect of inlet flow velocities on a pipe of certain length. To ideally do this, I will define velocity inlet parameter in Fluent(standalone) and enter multiple values so Fluent solves for each individual value. How would I go forward with this ? One idea(rather a complicated one) is to acess the name of the defined I/P parameter. Once the name of the parameter or its ID has been acessed, it's value an be looped using a 'do' loop in Scheme. Something like this:- Code: (do ((parameter start_value ( + parameter increment_value))) ((> x end_value)) (ti-menu-load-string ( format #f "set the parameter value" x)) ; HOW WOULD YOU THE SET THE VALUE (ti-menu-load-string (format #f"solve/iterate 10")) ;SOLVE THE SOLUTION WITH THE NEW PARAMETER VALUE ) Also, I am using Fluent 17.0

April 11, 2018, 16:55		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	In standalone Fluent, it's better to use the TUI commands rather that use the WB scripting language. If you insist on using parameters you would update a parameter by using: Code: /define/parameters/edit "nameofParameter" newValue The parameter option just gives you a convenient variable to assign as a BC. Really you could just edit the BC's manually in a Fluent .jou and not deal with any parameters. For example this would set the inlet velocity magnitude on a boundary called myInlet to 10 m/s. Code: /define/boundary-conditions velocity-inlet myInlet () vmag no 10 Please don't copy and paste this into your .jou because chances are, your case setup is different than mine and needs different inputs. I highly recommend to get familiar with entering text commands in to the Fluent interface. But you can see the commands to update a parameter and change a BC is not very different and doing either requires you to learn how to use the TUI. lytemar likes this. Last edited by LuckyTran; April 13, 2018 at 17:36.

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April 12, 2018, 09:39		#3
ishan_ae Member ishan Join Date: Oct 2017 Posts: 78 Rep Power: 9	Yes. I was thinking the same. A while later I realized that there would not be much of a difference if I looped the BC settings or the parameter values. I will go with looping the parameters since that seems a much striaghtforward way to do. Also, the command for editing the I/P parameters is not long.