I have attempted to utilize MFiX version 22.4 to run the user-defined drag model. Once I construct the solver, it indicates “Built Succeeded.” However, when attempting to start MFiX after the compilation step, the following problems appear.
Error from usr_drag.f:68
Error 9999: The user-defined drag routine was invoked but this
generic error message exits. Either choose a different drag law
or correct mfix/model/usr_drag.f
Kindly help me in this regard