Making it Rain

Malookiyat · October 16, 2018, 13:11

I just want to simulate falling rain with a 2mm droplet size and the ability to vary the volumetric flow rate of the rain into the domain. It didnt seem difficult with dispersed fluid method but Im not getting natural results. Anybody can help?

ghorrocks · October 16, 2018, 19:38

Are you doing this with a Lagrangian or Eularian model? Why?

What results are you getting?

Malookiyat · October 17, 2018, 10:41

Was Using a Eularian model with dispersed fluid. Trying to model an Air Curtain roof. I have since moved to using the Particle Transport Fluid method (Langrangian). It seems to be working, now my main concern is momentum transfer (drag force) from air jet into water particles. I dont know which model works best.

ghorrocks · October 17, 2018, 18:50

What is an air curtain roof?

The choice between Lagrangian and Eularian particle tracking methods should not be done on which model you can figure out, but on which model is more suitable for your application.

Why do you say the results are not good? What results are you getting? Please post some images and your CCL.

October 16, 2018, 13:11	Making it Rain	#1
Malookiyat New Member Saif Ul Malook Join Date: Sep 2018 Posts: 8 Rep Power: 8	I just want to simulate falling rain with a 2mm droplet size and the ability to vary the volumetric flow rate of the rain into the domain. It didnt seem difficult with dispersed fluid method but Im not getting natural results. Anybody can help? rua likes this.

October 16, 2018, 19:38		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Are you doing this with a Lagrangian or Eularian model? Why? What results are you getting? __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

October 17, 2018, 18:50		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	What is an air curtain roof? The choice between Lagrangian and Eularian particle tracking methods should not be done on which model you can figure out, but on which model is more suitable for your application. Why do you say the results are not good? What results are you getting? Please post some images and your CCL. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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October 17, 2018, 10:41		#3
Malookiyat New Member Saif Ul Malook Join Date: Sep 2018 Posts: 8 Rep Power: 8	Was Using a Eularian model with dispersed fluid. Trying to model an Air Curtain roof. I have since moved to using the Particle Transport Fluid method (Langrangian). It seems to be working, now my main concern is momentum transfer (drag force) from air jet into water particles. I dont know which model works best.