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Hello Andy,
What you are doing seems correct to apply a pulsating inlet velocity with the ICFD solver in LS-DYNA. You are using the *ICFD_BOUNDARY_PRESCRIBED_VEL keyword and specifying the pulsating inlet velocity using a load curve with *DEFINE_CURVE_FUNCTION. Also, *ICFD_BOUNDARY_PRESCRIBED_VEL is applied to part 1 which is the inlet.
The warning message is about the *ICFD_MAT ID=1 card. Could you post a screenshot of *ICFD_MAT ID=1 in your model? Are load curves ID 1701669236 and 41 refered to in *ICFD_MAT ID=1? Do you have these load curves defined in your model with the *DEFINE_CURVE keyword?
Also, what happens if you run this model with the LS-DYNA solver? Do you get an error message? If so, what is it?
Reno.