Discussion Forum

Hi,

I tried to simulate corona discharge of coaxial cylinders refering a book. So I considered one electrostatics physics (to solve poisson eqn) and 3 physics nodes of transport of diluted species for electrins, positive ions, and negative ions (to solve continuity equation).

The positive volatge is applied for one electrode which the voltage increases with time and other electrode is ground.

In transport of dilued species, covection mode was selected.

Space charge density boundary condition was defined by taking electrons positive ions and negative ions.

At the positive electrode, as the electric field strength is greater than zero, the flux of electrons and negative ions are assumed to be positive convective flux(outflow subnode) and the flux of positive ions at the wire is assumed to be zero(flux subnode). (I found this theory from a thesis)

1)The attached model has the eror with Failed to find consistent initial values. Last time step is not converged. I can not find the reason behind the error. I tried several methods by changing boundary conditions and solver parameters.

2)I am not sure of coupling of physics nodes(it means concentations of each species is needed by electrostatics and each transport physics need the electrica field solved by electrostatics)

3) is it incorrect to take 3 transport of dilued species physics for each species?

Could you please check my model and give comments on the mistakes and the reason for the error?