Multiphase Eulerian Two Phase Flow/ Evaporation of Water at Hot Surface

- July 8, 2019 at 1:58 pm
  
  NITHINMN
  Subscriber
  
  Dear Sir/Madam,
  
  I have an Eulerian Multiphase model with 2 Phases and is pressure based solver. Also I use Multifluid VOF Model for my simulation. The diameter of my second phase is computed by an User defined function. The minimum diameter of secondary phase is 0.1 mm and maximum is 0.15 mm. I have used ANSYS ICEM to mesh my domain which has only hexahedral cells after meshing. Heat Equation is turned on for this simulation, where the process is evaporation of water touching hot surface.
  
  My question is, if in my domain after meshing, if there are cells whose side lengths are less than 0.1 mm near the evaporating surface, should this affect the results.? Or is it okey to have cells which has side lengths less than 0.1 mm in my case, eventhough minimum diameter of vapor bubbles (secondary phase) from UDF is 0.1 mm.
  
  Thank you in advance.
  
  Best Regards,
  
  Nithin
- July 9, 2019 at 5:04 am
  
  DrAmine
  Ansys Employee
  
  You are using an interpenetraring continuum based approach so the mesh is okay.
  
  If you want to resolve the scales you need finer mesh.
- July 16, 2019 at 8:03 am
  
  NITHINMN
  Subscriber
  
  I tried simulating with smaller cell sizes than disper phase diameter, simulation could succedd but the convergence of mass continuity has been highly affected and a slight deviation in results were also noticed.
- July 16, 2019 at 8:08 am
  
  DrAmine
  Ansys Employee
  
  Are you trying to resolve the bubbles? How many bubbles do you have?
- July 16, 2019 at 8:15 am
  
  NITHINMN
  Subscriber
  
  No, vapor bubbles are generated during evaporation. I am capturing the heat transfer at the surface.
  
  Regards,
  
  Nithin

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