Convective flux exceed limit warning

quemmo · September 27, 2011, 11:07

Hello everyone !

I am studying flows in fuel tank pipes. I already ran smulations with several pipe designs, and the simulation went well, no warnings and errors. Moreover, the simulations represented quite well the reality. But, i have got problems with other pipe designs. As soon as i run the simulations, i have a convective flux exceed limit warning. And the simulations don't represent the reality at all. Yet, i use the same parameters, the same blocks meshes, the same boundary conditions...The designs change a little bit : the nozzle slopes more than the previous.

So here is my question : can a convective flux exceed limit warning modify the flow significantly ?

Thanks

JBurnham · October 5, 2011, 11:57

No, convective flux warnings only alert you that the time step is being reduced, and the cycle runs again. Convective flux warnings do not affect accuracy. There's probably something else going on.

September 27, 2011, 11:07	Convective flux exceed limit warning	#1
quemmo New Member Join Date: Jun 2011 Posts: 8 Rep Power: 14	Hello everyone ! I am studying flows in fuel tank pipes. I already ran smulations with several pipe designs, and the simulation went well, no warnings and errors. Moreover, the simulations represented quite well the reality. But, i have got problems with other pipe designs. As soon as i run the simulations, i have a convective flux exceed limit warning. And the simulations don't represent the reality at all. Yet, i use the same parameters, the same blocks meshes, the same boundary conditions...The designs change a little bit : the nozzle slopes more than the previous. So here is my question : can a convective flux exceed limit warning modify the flow significantly ? Thanks

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October 5, 2011, 11:57		#2
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	No, convective flux warnings only alert you that the time step is being reduced, and the cycle runs again. Convective flux warnings do not affect accuracy. There's probably something else going on.