[amscosta]

Hi All,
I want to patch an initial flow field for a given 2D mesh.
The field is given by the expression in the attached image.
K = 10^5 m^2/s , x is in the [-1,1] km interval, y is in the [-1,1] km interval.
The flow is not defined for sqrt(x) < 0.1 km and sqrt(y) < 0.1 km.
Any piece of advice of how to setup that is very welcome.
Thanks,
Alex

[vinerm]

Though you can use UDF for this but that will be an overkill if you have to do it only for one or two cases. So, solution would be to use Custom Field Functions and Registers.

The equations can be defined as CFFs. Then you mark cells using region or iso-values to create various registers. Then do the patching in the registers using CFF. Do note that to use iso-value for creating registers, you need to initialize the case. You can initialize with any values. Registers are nothing but subsets of mesh that are marked based on certain criterion specified by the user. Do it using Adapt but do not click on Adapt. Click on Mark.