[niket_thatsme]

Hi all,

This is my first post, but I have been lingering here quite often. I am trying to simulate fluid transfer in zero-gravity. I have created model in Solidworks.

Here is the brief of what I have done till now:

1. I have set the whole assembly as a single, fluid region.
2. I have attached a pic named physics.jpg which shows the physics continuum.
3. There is axis of rotation at [0.2,0,0] in the direction [0,1,0] and I have specified the rotation at the appropriate place.
4. I have created a function called Initial_Water, which will depict the initial place of water in the whole setup. This is shown in the image titled scalar1.jpg
5. When I flip the signs to designate the initial position of air, it doesn't work. I have attached an image called air.jpg You will be able to see how it fails.
6. Here are the different field functions that I have used:

• [0,0,-$omega*($$Position[0]-$xAxisRotation)] - initialFluidVelocity
• ($$Position[0]>=0.45)?1:0 || ($$Position[1]>=0.15)?1:0 - Initial_Water
• (2*3.14159/60)*${RPM} - omega
• RPM is set to 15 rpm.

I have a very nice hexa mesh that is also attached. I need help with setting the initial position of air. Also, I would like to know how can I have complete water volume be displayed in simulation. I have been using iso-surface to visualize the water volume surface.


Also, what language syntax does the "User Code" follow ?



I hope the attached pics are able to explain clearly.


I would appreciate your help.


Thank you !


Geometry1.jpg

physics.jpg

scalar1.jpg

air.jpg

trial 2_Mesh Scene 2.jpg

[me3840]

For VOF sims I usually just make the second field function for the second phase something like:

1-$Initial_Water

which means you only have to set the first one.

[me3840]

The user coding is done in C++, but it's pretty rare user coding is necessary.