# How to model a moving droplet source?

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 March 5, 2009, 13:27 How to model a moving droplet source? #1 James Guest   Posts: n/a Sponsored Links Hi,evryone: I am modeling a droplet coating process. The droplet source moves, relative to the base material. The Droplet Source Model says that the droplets are generated at a fixed location. Can I let the droplet location coordinates be a function of time? Thanks! James

 March 5, 2009, 20:36 Re: How to model a moving droplet source? #2 HC Guest   Posts: n/a Maybe you can do some customization in qsadd.F and modify the array xdrop, ydrop and zdrop after each cycle, to mimic the location change.

 March 6, 2009, 12:02 Re: How to model a moving droplet source? #3 James Guest   Posts: n/a Thank you! Can I let the base material move instead and let the droplet source be stationary?( Or Can I use the mass momentum source model to do this modeling? I don't know what the difference is between the droplet source model and the mass momentum source model. It seems that the latter can do the same thing as the former.

 March 6, 2009, 12:36 Re: How to model a moving droplet source? #4 HC Guest   Posts: n/a I am not sure what you meant by letting the base material move. If you are talking about using moving object model, you may need to give some more details on how you want to set up the problem; if it is about non-inertial frame, I am afraid that it won't be applicable as the non-inertial frame will be applied to the whole domain which includes the sources. About the difference between the two models, when the droplet bubble source model is applied, numerically the droplets/bubbles would just replace the surrounding fluid in one step, while the fluid from the sources will try to push the surroundings when the mass/momentum source model applied. Also, in the droplet bubble source model, the droplets/bubbles has a spherical shape. In the mass/momentum source model, the fluid would come out in a stream.

 March 6, 2009, 12:50 Re: How to model a moving droplet source? #5 James Guest   Posts: n/a HC, thank you very much! When I mentioned letting the base material move, I mean there is a relative movement between the droplet source and the base material. So there are two ways to model it. One way is to let the droplet source change its location during the process; the other way is to let the base material move, relative to the droplet source. But I think the latter way may need larger computational domain. Is that right?

 March 6, 2009, 12:57 Re: How to model a moving droplet source? #6 HC Guest   Posts: n/a Yes, it sounds about right, as long as you the motion properties of the base material.

 March 6, 2009, 14:00 Re: How to model a moving droplet source? #7 James Guest   Posts: n/a Thank you very much! I know the motion path of the base material.

 March 6, 2009, 17:19 Re: How to model a moving droplet source? #8 James Guest   Posts: n/a So I should use the moving object model to do this? By the way, do you mean the Moving Solid Phase model by moving object model? Thanks!

 March 6, 2009, 17:37 Re: How to model a moving droplet source? #9 HC Guest   Posts: n/a It depends. If the base material is flat, you may just use a wall boundary to mimic the base material and specify the velocity at that wall boundary. Or as you said, you can turn on the moving object model and create a moving component to mimic the base material.

 March 8, 2009, 01:31 Re: How to model a moving droplet source? #10 James Guest   Posts: n/a Thank you! Since I need to model the internal heat transfer within the base material, I cannot just set it as a rigid wall boundary. Then I will use the Moving Solid Phase Model. Is it the same thing as Simple Moving Objects?

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