UDF for body force

hyungsu ahn

 

Hello, 

I found that there was an issue to apply gravitational force (x, y, z) from test data. (simlab 2024)

Multiplier function support only 1 direction of time-dependent data. (2 column array, time versus data).

I was trying to use momentum source command (it support 4 column array).

However,  time variable was not supported to use interpolation (linear or curve fit, whatever).

 

Is there any plan to support aforementioned issue at next release ? 

If no, UDF is feasible option for this ?

 

Thanks in advance.

JungKook(Kai) Jin

Hello, Ahn

What you mentioned is currently only applicable to UDF, but it will be developed in the future.

Please find attached the Bodyforce Input file and UDF file of X,Y,Z over time. (4 coulmn array)

Thank you.

acupro

You are correct - the multiplier_function on the GRAVITY command applies to all three directions the same.

The GRAVITY command does support type = user_function:

https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/gravity_acusolve_com_ref.htm

as does the MOMENTUM_SOURCE command:

https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/momentum_source_acusolve_com_ref_r.htm

JungKook(Kai) Jin

Hello, Ahn

What you mentioned is currently only applicable to UDF, but it will be developed in the future.

Please find attached the Bodyforce Input file and UDF file of X,Y,Z over time. (4 coulmn array)

Thank you.