Hi everybody

I wonder if someone could help me, please

I simulate combustion in a cylindrical furnace. I have a continuous gas phase (create in PDF) and there are too some DPM combusting injections. For the injections I use the material anthracite and the Rosin Rammler method. At the beginning I used the min, max, mean diameter and the spread parameter purposes in the fluent5 tutorial guide (Pulverized coal combustion...) After my case is converged, I decreased the min and mean diameter and spread parameter (max diam stay equal) for an other situation. And I iterate... Now I have no more convergence And the residuals do not appear well soon...

Has anybody tried this experience? Could anybody help me

thanks a lot

Bye olivier

A) Based on the particle size distribution, you should have realistic, mean, min, max and spread parameter in RR particle distribution model. B) When you changing the parameters: why don't u start from the beginning and set some realistic parameters? B1) Or after first convergence, reset DMP calculations. B2) I don't understand, why did you change the parameters after converging the first case. Are you running another case now with different size of particles ?

DC

Hi David A/ In fact at the beginning of the study I didn't have any information about a realistic mean, min max and so a spread parameter for the RR particle distribution. Therefore, I decided to simulate a case with the fluent tutorial parameters. B/ Now, I know the realistic parameters and therefore I simulate a new case with the realistic RR parameters. I got some problems to converge the case. But now it is okay with the convergence. I can anlyse the results.

Bye bye and thanks olivier