Reply To: Volume Fraction too Low. How to Improve?

[abdullahhassan]

Hi, 

below is the inlet BC.

Below is the outlet BC.

For side wall temperature: as temperature was fixed at 273.15K . you can see the volume fraction and temperature in below screenshot. even at tubewall_vapordomain, the volume fraction is too low but saturation temperature is 300K.

 

Point to note:

1- after some iterations, my pressure inlet outlet values become same which is 968150Pa. as per setting this is outlet pressure and inlet pressure is 1061700Pa. i don't understand why.

2—In multiple simulations, sometimes mass flow remains the same or shows a minor change at the outlet. Sometimes, mass flow at the outlet increases drastically, but in this case, mass flow is not changing. 

3—As you suggested, I have turned off the fixed temperature from the cell zone and want to apply convection at the near-wall BC. Are you suggesting that I put a temperature value at the Tubewall_vapordomain interface or at tubewall1, which is the innermost wall of the tube?