Modelling a plasma gasifier

Dear,

For my master's thesis I am modelling a plasma gasifier, without using the plasma module, but only

- the heat transfer module (fluid and solid)
- Fluid flow Laminar
- Radiation in participating media

I found a way to simulate these three physics (by using a parametric sweep), but now I want to insert a k-epsilon turbulence model and it looks impossible to solve this, everytime I get an error from the stationary solver that there is no solution( singular matrix).

Can anyone help me to build an effective solver?

Kind regards,

Matthias Materné
matthias_materne@hotmail.com