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Calculating bubble diameter from axisymmetric capillary bubble growth simulations

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Old   February 15, 2022, 20:38
Default Calculating bubble diameter from axisymmetric capillary bubble growth simulations
Venkat Ganesh
Join Date: May 2020
Location: Cincinnati, Ohio
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I'm trying to calculate the departing bubble diameter from my simulations. My mesh domain is axisymmetric based on the assumption that the bubbles are symmetric and spherical in shape. An image of the setup is attached (pardon the unnecessary details of zones, I've reused the image from an earlier question on meshing).

The workflow I'm following in Paraview for postprocessing the bubble size is as follows.
  1. Stop at the frame closest to bubble departure as in the image.
  2. Use threshold filter to filter by alpha between 0.5-1.
  3. Use Clip filter to draw a box as shown in the same image.
  4. Use Angular Periodic Filter to rotate it by a direct angle of 5 (wedge angle) to obtain the complete bubble
  5. Use Integrate Variables filter to get the cell volume, which would be equivalent to the bubble volume(V) in this case.
  6. Calculate bubble diameter as d = (6V/π)^(1/3).

I'm getting values that are way off from the experimental values and prior computational values obtained using FLUENT. Can someone verify my approach or suggest changes if any to my method of calculating the bubble diameter?
Attached Images
File Type: jpg Mesh Domain.jpg (60.4 KB, 5 views)
File Type: png Departure_bubble.png (49.9 KB, 5 views)
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bubble diameter, paraview, post processing, vof

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