Dear All,

I am working on a model for the simulation of glucose depletion in a perfusion bioreactor chamber, due to consumption by cells seeded on the luminal wall of a Tissue Engineering Vascular Graft. The problem is 2D axisymmetric, and the physics involved are: Free porous media flow, Transport of diluted species, and Darcy's law.

To replicate the closed-circuit condition, I defined a periodic boundary condition on the fluid flow; in parallel, I also defined the same periodic condition on the concentration, in the tdl branch.

To simulate the time dependency of the inflow value with respect to the outflow one (i.e. c_outlet (t)= c_inlet(t+1)), I placed a boundary probe (bnd) on the outlet to store the average of the c on the boundary. Finally, I defined the inflow as prev(bnd, 1).

Sadly, but not unexpectedly, i got an errore message saying :

"Failed to find consistent initial values.

Previous time step not stored

Operator: prev, Geometry: geom1, Boundary: 11

Failed to evaluate expression"

I assume the error refers to the lack of a stored previous values at the first timestep. is there a way to circumvent that?

Thanks.