View Fluid Film when Impingement

Nikita13 · June 5, 2019, 04:32

Hi friends!

For the moment I am researching the impingment of a spray on a surface.
When I select scalar scene Fluid Film Thickness nothing shows.
Multiphase interaction between film and spray is on, shell region is created.
Maybe is something about axis direction in the physiscs values of the shell region?

Do you know what is happening? Please help

Nikita13 · June 6, 2019, 10:05

I checked and particles seem to not be getting to the wall. Maye that is the reason why Fluid Film is not showing.
When I see Volume Fraction of Droplets, the are halfway between the injector and the surface and they don´t move.
Could it be because of amount of sub-steps for the implicit unsteady solver?
Hanging here and don´t know how to change the simulation to have it run properly.
Thanks!!

nalamyogesh · June 12, 2019, 12:45

If they are not reaching till the surface from the injector, is it because the total physical time you are running is very less for the droplets to travel that distance?

Nikita13 · June 12, 2019, 13:01

Quote:

Originally Posted by nalamyogesh

If they are not reaching till the surface from the injector, is it because the total physical time you are running is very less for the droplets to travel that distance?

How would you make that change? With number of substeps, changing the Courant number, maybe with a change in time step?

I have calculated with a big number for substeps and the droplets still not reaching the wall. Thank you!

nalamyogesh · June 12, 2019, 13:07

In stopping criteria, change the 'Maximum Physical Time' or ' Maximum Steps'.

If this maximum physical time is sufficient for the velocity of droplets and the distance you want them to travel, may be the Maximium Steps is stopping the simulation. You can then increase maximum steps.

June 5, 2019, 04:32	View Fluid Film when Impingement	#1
Nikita13 New Member Join Date: Jun 2019 Posts: 3 Rep Power: 6	Hi friends! For the moment I am researching the impingment of a spray on a surface. When I select scalar scene Fluid Film Thickness nothing shows. Multiphase interaction between film and spray is on, shell region is created. Maybe is something about axis direction in the physiscs values of the shell region? Do you know what is happening? Please help

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June 6, 2019, 10:05		#2
Nikita13 New Member Join Date: Jun 2019 Posts: 3 Rep Power: 6	I checked and particles seem to not be getting to the wall. Maye that is the reason why Fluid Film is not showing. When I see Volume Fraction of Droplets, the are halfway between the injector and the surface and they don´t move. Could it be because of amount of sub-steps for the implicit unsteady solver? Hanging here and don´t know how to change the simulation to have it run properly. Thanks!!

June 12, 2019, 12:45		#3
nalamyogesh Member Yogesh Nalam Join Date: Sep 2012 Location: München, Germany Posts: 54 Rep Power: 13	If they are not reaching till the surface from the injector, is it because the total physical time you are running is very less for the droplets to travel that distance?

June 12, 2019, 13:07		#5
nalamyogesh Member Yogesh Nalam Join Date: Sep 2012 Location: München, Germany Posts: 54 Rep Power: 13	In stopping criteria, change the 'Maximum Physical Time' or ' Maximum Steps'. If this maximum physical time is sufficient for the velocity of droplets and the distance you want them to travel, may be the Maximium Steps is stopping the simulation. You can then increase maximum steps.