[IronLyon]

Hello , I want to use the mass flow rate as the inlet, before I just defined it as constant value or write in the expression and use a function. However, the function what I used is just an approximate fuction calculated from my experiment date, that was not realistic. So now I just want to input the time point and the correspond mass flow rate, like create an Excel data and then use choose the ''Tool'' - ''Initialize Profile Date'' to upload the excel data (is that true, I don't have experience)?
I will try that and want to know, what is the right form to write in the excel? Like:
Time point [s] mass flow rate [kg s-1]
0 0
0.5 1.25
1 2.1
1.5 3.2
2 3.9
...
I tried, but it said ''Invalid format''. How could I input the data in a right way? Thank you!

[evcelica]

Just create a user function in cfx-pre.

You can either type in the data points, or import a text file with just 2 columns of data (numbers only). Define the units of the independent variable time [s] and result variable [kg/s]. Then use this function as your inlet mass flow condition: MyFunctionName(t)

[AtoHM]

https://www.sharcnet.ca/Software/Ans....html#i1310599


I attached an example with variable mass flow. Once imported into pre you can reference the profile by its expression as MassFlowRate.Mass Flow Rate(Time) within the boundary setup.

[IronLyon]

Originally Posted by evcelica

Just create a user function in cfx-pre.

You can either type in the data points, or import a text file with just 2 columns of data (numbers only). Define the units of the independent variable time [s] and result variable [kg/s]. Then use this function as your inlet mass flow condition: MyFunctionName(t)

Thank you!

[IronLyon]

Originally Posted by AtoHM

https://www.sharcnet.ca/Software/Ans....html#i1310599


I attached an example with variable mass flow. Once imported into pre you can reference the profile by its expression as MassFlowRate.Mass Flow Rate(Time) within the boundary setup.

Thank you!
I succeed in using txt to write the fuction. The pic is shown as flowing:
1111111.PNG
And then in the inlet using the user function, after loading it likes
MFR.Mass Flow Rate(), then the only thing needs to be done is add the Time like MFR.Mass Flow Rate(Time).

[IronLyon]

[solved and further question delete]

[3nhu1]

Originally Posted by IronLyon

Thank you!
I succeed in using txt to write the fuction. The pic is shown as flowing:
Attachment 70000
And then in the inlet using the user function, after loading it likes
MFR.Mass Flow Rate(), then the only thing needs to be done is add the Time like MFR.Mass Flow Rate(Time).

Many thanks- this helped me

[brenohc]

Does this works for fluent as well, the same file format? I am trying to solve a CHT problem in fluent using my cfx user function but I cannot find a way to add interpolation functions in fluent. Can anyone show me how?

[Opaque]

Originally Posted by brenohc

Does this works for fluent as well, the same file format? I am trying to solve a CHT problem in fluent using my cfx user function but I cannot find a way to add interpolation functions in fluent. Can anyone show me how?

Use the Profiles functions in Fluent
https://ansyshelp.ansys.com/account/...tml?q=profiles