velocity component with convergence difficulties

TallesC · April 9, 2016, 09:21

Personal I am turning a biphasic simulation stationary a leak of a spray (dispersed liquid phase) into the environment with mass transfer between the phases condensation-evaporation to heptane, at the hole exit am by setting the speed of sound (341 m / s), initially there is an oscillation that is already expected, but then waste start but dropped the y component (V-Mom-gas) gas phase does not converge and soon after other variables begin to oscillate and the simulation does not converge well after. any idea how I can solve the problem of convergence of this variable?

ghorrocks · April 10, 2016, 06:01

Your model is very complex and there is no way to debug it with the basic information you have posted.

Here is the general tips for obtaining convergence:
http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

TallesC · April 10, 2016, 08:41

hello, glenn !! Thanks for your comment. my simulation uses the same modeling example of the tutorial chapter 31: steam jet, but with a structured mesh, I decrease the number of elements of my mesh and the variable component that was teetering stabilized despite the convergence is taking some of that variable, you had seen something ???

ghorrocks · April 10, 2016, 18:41

Your model is going to be too complex to debug over the forum.

All I can suggest is to make sure your mesh is the best quality possible. This makes a massive difference in hard to converge cases like yours. So be very careful meshing and ensure no poor elements exist.

April 9, 2016, 09:21	velocity component with convergence difficulties	#1
TallesC Senior Member Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 101 Rep Power: 13	Personal I am turning a biphasic simulation stationary a leak of a spray (dispersed liquid phase) into the environment with mass transfer between the phases condensation-evaporation to heptane, at the hole exit am by setting the speed of sound (341 m / s), initially there is an oscillation that is already expected, but then waste start but dropped the y component (V-Mom-gas) gas phase does not converge and soon after other variables begin to oscillate and the simulation does not converge well after. any idea how I can solve the problem of convergence of this variable?

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April 10, 2016, 06:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Your model is very complex and there is no way to debug it with the basic information you have posted. Here is the general tips for obtaining convergence: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F http://www.cfd-online.com/Wiki/Ansys...gence_criteria

April 10, 2016, 08:41		#3
TallesC Senior Member Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 101 Rep Power: 13	hello, glenn !! Thanks for your comment. my simulation uses the same modeling example of the tutorial chapter 31: steam jet, but with a structured mesh, I decrease the number of elements of my mesh and the variable component that was teetering stabilized despite the convergence is taking some of that variable, you had seen something ???

April 10, 2016, 18:41		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Your model is going to be too complex to debug over the forum. All I can suggest is to make sure your mesh is the best quality possible. This makes a massive difference in hard to converge cases like yours. So be very careful meshing and ensure no poor elements exist.