Hello ,
I am trying to simulate fluid flow and couple to species transport in a pipe section of diameter(d) ~5 micrometers and it branched into two pipes of d/2 and merger to form a pipe of dia, d again.
Inlet velocity = 0.00018 m/s and pressure boundary condition is 10Pa.
While trying ot simulate, the fluid flow simulation fails with the following error
Undefined variable. - Variable: timestep - Geometry: geom1 - Boundaries: 2, 4 Failed to evaluate Jacobian of expression. - Expression: (comp1.dsp.stab_ds_c3)*(dvol)
I am also attaching the mph file. Any suggestions on how to resolve this error?