Scalar Transport values too large
 

I am trying to solve the simple channel flow with a UDS defined for solute concentration in the flow.



I have used UDF macros to define the boundary conditions and the diffusivity, density and viscosity.



I am using the mass flow rate for the convective flux
and don't have a source term.


The solution converges but the value of the UDS is extremely high (10^7) and the value grows extremely fast (within 5-10 iterations).


Can anyone suggest any checks or ways to figure the source of the problem.

I strongly feel there is a problem with the UDF but everything seems really fine.

:(

Maybe you made a udf that generates conditions for which those large values are a solution. If you don't show your udf, it is hard to say if it has a problem...

Hi Pakk,


It took me a while too clean the code and have in some documentation (though minimal).


below is the link where you can have a look


https://github.com/zobekenobe/UDS-Flux.git


Please have a look and share your insights.


Looking forward to your reply.


Thanks