[harsha2398]

Hello,

I am running a cold-flow simulation of a combustion chamber in a turbine for my project and basically, I move from SIMPLE first-order schemes (250 it.) to second order upwind (500 it.) and finally, COUPLED pseudo-transient (2000+ it.) to arrive at the solution. While the SIMPLE schemes' iterations take around 2 hours to complete, the pseudo-transient COUPLED (or just COUPLED for that matter) iterations - estimated according to FLUENT in the console - take 400+ hours and keep increasing iteration after iteration!!

Here's a picture of the mesh cross-section: https://1drv.ms/u/s!As6k8_h0tQpljv5xqp7UyEwktHg3JQ

The mesh has 3,314,331 polyhedral cells.
Operating conditions: 4% pressure drop from the plenum (left) to the outlet (right, the exit of the combustion chamber)
I am running this case on my Inspiron 5558 in parallel (Solver: 4 processes) (16GB RAM, dual-core, i7 Ultrabook processor).

Could anyone tell me why this is happening? Is this merely a lack of computational resources? What else could be done to achieve convergence?

P.S: A layman's explanation as to what a timescale factor is and what it means would be much appreciated as well (I used 0.1 in this simulation)