[Roh]

Guys
I've a nozzle that injecting N2 to the air. I was trying to solve the project and used the Spicies Transport model without reaction for this job. Everything's ok but its Residual is strange to me. The residual of N2 is around 1e+30! at first that it starts the calculation and the Courent number is between 1-15, N2 residual is under zero but when I increase the courent number and reduce the timestep size it goes above 1 gradually. Nevertheless, the calculation looks Ok. I checked the countor of Pressure, temp., concentration etc but haven't seen any problem. is it ok that the residual of N2 is around 1e+30?


Here is a screenshot of the residuals

[AlexanderZ]

no

best regards

[blackmask]

The residuals are normalized by the maximum value of first several steps because the residuals are usually large at the start of calculation. In your case you increase the time step by several order of magnitude thus the reference values are no longer appropriate. Although there is nothing wrong it looks wired. You should use monitors->residual->renormalize to make it look more appealing.

[Roh]

Originally Posted by AlexanderZ

no

best regards

To which question? It's not ok, right?

Originally Posted by blackmask

The residuals are normalized by the maximum value of first several steps because the residuals are usually large at the start of calculation. In your case you increase the time step by several order of magnitude thus the reference values are no longer appropriate. Although there is nothing wrong it looks wired. You should use monitors->residual->renormalize to make it look more appealing.

Ok, Thank you. Going to fix it.