divergence in two phase flow

ndtrong · October 24, 2016, 07:43

Hi everyone,

It is appreciated if some one could help me on this problem,

Recently, I am using Ansys Fluent to do simulation of flow fields around a simple rectangular box with bottom of box is assumed on a flat plat. I specify the inlet with pressure inlet and the outlet with pressure outlet, the other domains are set by wall. The VOF method is used with Open Channel Flow is selected. The assumed velocity is 2 m/s, minimal spacing from box is 0.01 (m). The problem is set run with transient condition and time stepping dt is set at 0.001.
My simulation run well with 100 first iterations, however, it appears suddenly with AMG solver divergence for pressure correction despite of the fact that residual of flow variables is decreasing and floating points.
I really do not know what is the reason for this error, could someone help me to make clear it.

Thank you very much,

hwet · November 1, 2016, 03:08

post pictures of setup, geometry and divergence

October 24, 2016, 07:43	divergence in two phase flow	#1
ndtrong Senior Member Nguyen Duy Trong Join Date: Apr 2014 Posts: 124 Rep Power: 12	Hi everyone, It is appreciated if some one could help me on this problem, Recently, I am using Ansys Fluent to do simulation of flow fields around a simple rectangular box with bottom of box is assumed on a flat plat. I specify the inlet with pressure inlet and the outlet with pressure outlet, the other domains are set by wall. The VOF method is used with Open Channel Flow is selected. The assumed velocity is 2 m/s, minimal spacing from box is 0.01 (m). The problem is set run with transient condition and time stepping dt is set at 0.001. My simulation run well with 100 first iterations, however, it appears suddenly with AMG solver divergence for pressure correction despite of the fact that residual of flow variables is decreasing and floating points. I really do not know what is the reason for this error, could someone help me to make clear it. Thank you very much,

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Discrete Phase Model, outlet mass flow rate does not fit	edu_aero	FLUENT	29	February 3, 2020 09:38
About Some Concepts:Laminar flow, turbulent flow, steady flow and time-dependent flow	Jing	Main CFD Forum	8	October 5, 2018 18:02
Difference in flow distribution of single phase and multiphase analysis	shivasluzz	CFX	0	April 22, 2015 23:54
How to go about modeling injection nozzle two phase flow in FLUENT?	skonda2	Fluent Multiphase	0	March 17, 2015 08:52
low speed compressible two phase flow??	cat	CFX	0	November 15, 2005 08:59

November 1, 2016, 03:08		#2
hwet Senior Member Join Date: Mar 2014 Posts: 375 Rep Power: 13	post pictures of setup, geometry and divergence