Discussion Forum

Hi

that is a good remark, the intop() operator only applies to a defined boundary, and in the level set method you have only virtual boundaries

It's not a physics I'm used to work with so I'm not sure what to propose. Have you cheked the models in the model library ?
Perhaps you can define a Results Data Set - cut line/circle and integrate that if this works for a line I'm not sure how to generate a circle, with cylindrical coordinates ?

If nobody ca give you a tip here, probabl the best is then to as "support". If so pls reportack it's an interesting question ;)

--
Good luck
Ivar

You should try integrating the quantity of interest multiplied by an operator that represents the volume fraction of the fluid you want to measure. If Vf1 is the volume fraction variable I would try either multiplying by “*(Vf1>0.5)” or even just “*Vf1”.

Nagi Elabbasi
Veryst Engineering

Dear all
Finally I got the answer that we can integrate(surface) the delta function which is equivalent to perimeter of the bubble. For level set method delta function is 6*abs(phils*(1-phils))*(philsr^2+philsz^2+eps). Similarly, the perimeter or circumference of a circle with equivalent diameter da which has an area equal to that of a bubble can be calculated by (intop1((phils>0.5)*2*pi))^0.5.
circulatory = perimeter of area equivalent circle/perimeter of bubble
For a perfectly circular bubble the circularity is equal to unity and will decrease as the bubble
is deformed.

Terminal velocity can be calculated using following expression
Vt = (intop2((phils>0.5)*w))/(intop3((phils>0.5)))

Once again thank you both Invar and Nagi

Neel
Chemical enginnering

I am simulating deformation of an water drop due to electric field (outer fluid is oil), using phase filed model. I am getting the volume fraction plot. I want to measure the change in the area of the drop with time. What expression should i plot to see the area change in the water drop?