Droplet Impingement Simulation Refinement
I am trying to model the impingement of a droplet on a solid surface. So far I have run an axisymmetric case with the VOF model (implicit body force, unsteady, implicit) and used the Static Contact Angle approach. I have used an uniform quad mesh which is very refined. But however, after the first impact the droplet seems to split up in two and then rejoin and then further illustrate the oscillations with the pinning and depinning phenomena. However, I am not satisfied with it.
I would like your opinion about the following:
1. Is using a Dynamic mesh necessary to reduce computation time if I want to use a coarse mesh throughout and just refine the near interface region and the droplet moves.
1 a. Has anyone done this?
2. I am new at using UDF's, but would like to learn how to include the different models for dynamic contact angles(DCA) to better simulate experimental conditions? Would the UDF give me options in specifying the contact angle in the wall adhesion tab in boundary conditions.
3. In case of using a UDF I would like to be able to read the velocity of the contact line and thus compute the dynamic contact angle from there which would be used in Fluent's CSF formulation to compute the droplet spreading. Can anyone help with this?
Dynamic contact angle
The droplet may split into two/multiple fragments depending on the Weber no at the time of impact. If the impact velocity is very high, there's possibility drop will split. However use of static contact angle is a limitation to model such kind of problem where the contact line keeps on moving and no slip boundary condition at the wall is not the appropriate BC. To overcome such problem, a time dependent contact angle (dynamic contact angle) profile can be applied through "define profile" macro.
Hello , could you tell me what boundary conditions you used , please ?
thanks in advance
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