[mpieber]

Dear forum members,

when having a look at Fluent's UDF DEFINE_UDS_UNSTEADY, I noticed that the description and example given in the documentation only uses a first-order accurate time discretization scheme and constant density.

Is it possible to use also

• a second-order accurate time discretization scheme, and/or
• a non-constant density

within this UDF?

Thanks for your help!

Best regards,
Markus

[vinerm]

The example given is exactly that, an example. You can certainly use second order scheme. As far as density is concerned, it is to be used from the setup. If the density is set as constant in the case setup, there is no point in using a variable density within this function.