Falling Droplet using InterFoam
Hi guys,
I am trying to simulate a 3D droplet falling due to gravity forces with interFoam as simple as that. When the droplet reaches a velocity I will put it in a jet flow using mapFields. I have encountered some strange things and I cant even do the first part. a) Should I change the pressure inside the droplet due to the surface tension? p=2*sigma/r. What about the distribution of pressure inside the droplet due to gravity? b) Do you believe that the outcome would be the same if I enter a velocity in funkySetFieldsDict? c) Finally, the droplet disintergrates very quickly before it reaches the velocity (1m/s) which is totally unnatural. Why is that? (personally, I do not think it is about contact angle) Thank you for you time Kostis |
You should not change the pressure. Solver must calculate it during the solution.
If droplet disintegrates, I believe it is due to mesh, change the mesh and see if it is improved. I have another problem; Right before droplet hits the surface, it stops moving, and hangs around in the air! I have no idea why this happens for my case! |
cosbergel, I have been having trouble with a 3D droplet behaving almost the same way you described. My grid is refined to .1mm spacing for a 2mm droplet which I thought was sufficient. An order of magnitude refinement did not help. Were you able to figure out your problem? I was using multiphaseInterFoam, but the advice should probably be similar for both.
I appreciate any help! |
@ sfotovati as far as the pressure is concerned, you are right that the solver calculates the pressure inside the droplet but I found out that it is better to put it as an initial condition because otherwise you ll have perturbations on the surface of the droplet.
I think that you have put wrong boundary condition on the wall. @btsusi I manage to solve my problem firstly by not using dynamic refinement and then by changing the div schemes (specially for alpha1) for interFoam and interDyMFoam which I had it finally working. In my opinion satisfactory number of cells inside a droplet is 50- 100. Regards, Kostis |
cosbergel,
Thank you for the quick response, I will try your advice! |
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