k-e model

rakib

I had defined a volume for an energy source for a certain span of time. After that I will start the momentum source. I chose the k-e turbulence model. I did not define any turbulent energy source. However when I start the iterations for the initial span when there had been no momentum source, the results obviously show no velocity profiles, but a temperature profile which I had got earlier by choosing the laminar model is also absent. I checked the k and epsilon values and they were substantial. Is there any way to get rid of these k and e for the initial span also. No problem if ( and obviously they will) they come at t> the span for which there has been no velocity.

Also can you please explain how these k and e come when there had been no velocity at all. All through this span there had been only the energy source.