Learning Forum

[vipul.gupta]

Hi 

How to load profiles at diferent time during transient simulation ?

Example: I need to change velocity profile at 100 sec, 300 sec, 500 sec & 700 sec. I have all 4 velocity profile files. Currently, I am doing manually, meaning at 100 sec, I am reading profile file for 100 sec and then assigning x, y & z components. Then at 300 sec, I delete old profile file, then reading profile file for 300 sec and then assigning x, y & z components. Same for 500 & 700 sec. But this manual process is very cumbersome because every time I need to track for time and change it manually. 

How to do it automatically, meaning using UDF?

What UDF micros i need to use? 

[Rob]

You may be able to do this via the Fluent Solution Steering options, at 100s the TUI command to read a new profile is triggered, along with the the commands to hook the various components. A UDF would likely need a look up table so may be more complicated than that, and DEFINE_PROFILE would be used. 

[vipul.gupta]

Thanks!

My time interval is not fixed, like i need to read profile files at 100 sec, 300 sec, 400 sec, 550 sec, 700 sec, 940 sec. So, the interval is not fixed. 

I want to know, If I need to use UDF, is DEFINE_PROFILE sufficient ? First, I need to import the profile file and delete old profile and then assign the velocity components using the new profile file. Is DEFINE_PROFILE sufficient to do all these jobs? If So, how to import profile file using DEFINE_PROFILE?

[Rob]

Read the Solution Steering: it's triggered at a time. Execute commands (set for "once") may also work. 

For DEFINE_PROFILE you would need to figure out how to get the boundary data applied, so you'd be looking at file read & interpolation in the UDF.