interFoam, water flowing down a curved surface: is it correct?

be89 · March 2, 2017, 07:47

Hello,

I'm simulating a multiphase air-water problem where water is flowing down a rectangular pipe onto a curved surface while filling a tank (see attached pictures).

I'm not sure about the shrinkage down the curved surface...is it correct?
I would expect the flow to get wider, not thinner.

What do you think about it?

Solver is interFoam, gravity is present and surface tension sigma is 0.07 N/m.

RK_Token · March 2, 2017, 07:55

Looks correct for me. The flow gets accelerated, hance the volume flow rate increases sind therfore the cross section needs to decrease to fulfil continuum condition. Its Like water flow Out oft a water tap.

Sent from my ONEPLUS A3003 using CFD Online Forum mobile app

Saideep · April 21, 2017, 14:22

Hi,

In your second figure it is a bit interesting that you see a completely smeared out volume fractions. In reality alpha is 1 or 0 and in a few cells in-between 0 and 1. Looking at the figure I guess you use a coarser mesh may be it is important you resolve it more finer from my perspective.

Else, I have tried interFoam on a microchannel with small heights around 10 microns. I did see similar sort of interface smearing. Later I shifted to Foam-Extend 1.6 which solved this issue.

Saideep

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March 2, 2017, 07:55		#2
RK_Token New Member RK_Token Join Date: Jan 2016 Location: Germany Posts: 5 Rep Power: 10	Looks correct for me. The flow gets accelerated, hance the volume flow rate increases sind therfore the cross section needs to decrease to fulfil continuum condition. Its Like water flow Out oft a water tap. Sent from my ONEPLUS A3003 using CFD Online Forum mobile app

April 21, 2017, 14:22		#3
Saideep Senior Member Saideep Join Date: Apr 2015 Location: INDIA Posts: 203 Rep Power: 12	Hi, In your second figure it is a bit interesting that you see a completely smeared out volume fractions. In reality alpha is 1 or 0 and in a few cells in-between 0 and 1. Looking at the figure I guess you use a coarser mesh may be it is important you resolve it more finer from my perspective. Else, I have tried interFoam on a microchannel with small heights around 10 microns. I did see similar sort of interface smearing. Later I shifted to Foam-Extend 1.6 which solved this issue. Saideep