Liquid height incrases in steady-state multiphase VOF -- CFD Online Discussion Forums

November 23, 2018, 10:24

Liquid height incrases in steady-state multiphase VOF

soheil_r7

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Soheil

Join Date: Mar 2014

Location: Helsinki

Posts: 21

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Hi,

The goal is simulation of water-air multiphase flow with Fluent in a steady-state mode and mrf (multiple reference frame). Height of the patch region for air (phase-2) is 17 mm inside a 57 mm height mixing vessel; 40 mm is water [figures are attached]. After about 1500-2000 iterations amount of liquid (water) starts to rise up until the tip of the tank, and amount of air decreases!! Contours and report of volume integral also shows the same trend. amount of water increases, while there is no sourse of any form...

* Tank top section is set to pressure outlet with backflow volume fraction for air 1.
* VOF model and also Eulerian-Multi-fluid VOF model were tested.

I do appreaciate any help and comments.

Attached Images

	initial water height contour.png (29.3 KB, 4 views)
	water height increase contour.png (45.5 KB, 2 views)
	fluid zone data.png (26.6 KB, 4 views)

Tags

fluent, mixing tank, multiphase, vof model

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