3 phase flow convergence problem

sampathevs · June 7, 2013, 01:47

Hi all,

I am working on a case study- oil , gas water separator ( 3 phase flow).
Getting convergence problem with continuity residual.
can any1 help me ?
Using pressure based , eulerian model with energy equation.

Thanks in advance

vigii · June 7, 2013, 02:51

Hi,

Once check all the values that are been defined to boundary conditions.

sampathevs · June 7, 2013, 06:21

hi,

boundary conditions are fine. even I am getting the results . But residuals are not converging. All my contour plots are matching with the case study results. But how to reach the convergence ?

oj.bulmer · June 7, 2013, 07:18

Have you explored if the flow is steady or transient?

OJ

RodriguezFatz · June 7, 2013, 07:49

Try coupled solver and reduce all relaxation factors & Courant number until solution converges.

oj.bulmer · June 7, 2013, 08:05

Multphase problems are tricky to model and often transient - especially when Eulerian models are used. Are you running steady or transient?

OJ

sampathevs · June 7, 2013, 12:45

Im running with steady. I gave heat transfer as well. But could not observe any changes ..

June 7, 2013, 01:47	Multiphase convergence problem	#1
sampathevs Member EMAVI V SURYA SAMPATH Join Date: Aug 2011 Location: Malaysia Posts: 85 Rep Power: 15	Hi all, I am working on a case study- oil , gas water separator ( 3 phase flow). Getting convergence problem with continuity residual. can any1 help me ? Using pressure based , eulerian model with energy equation. Thanks in advance

June 7, 2013, 07:49		#5
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 27	Try coupled solver and reduce all relaxation factors & Courant number until solution converges. __________________ The skeleton ran out of shampoo in the shower.

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June 7, 2013, 02:51		#2
vigii Member Vignesh KPV Join Date: Oct 2011 Location: Bangalore Posts: 83 Rep Power: 15	Hi, Once check all the values that are been defined to boundary conditions.

June 7, 2013, 06:21		#3
sampathevs Member EMAVI V SURYA SAMPATH Join Date: Aug 2011 Location: Malaysia Posts: 85 Rep Power: 15	hi, boundary conditions are fine. even I am getting the results . But residuals are not converging. All my contour plots are matching with the case study results. But how to reach the convergence ?

June 7, 2013, 07:18		#4
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Have you explored if the flow is steady or transient? OJ

June 7, 2013, 08:05		#6
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	Multphase problems are tricky to model and often transient - especially when Eulerian models are used. Are you running steady or transient? OJ

June 7, 2013, 12:45		#7
sampathevs Member EMAVI V SURYA SAMPATH Join Date: Aug 2011 Location: Malaysia Posts: 85 Rep Power: 15	Im running with steady. I gave heat transfer as well. But could not observe any changes ..