problems with PlichErdman breakup model

azborals · January 24, 2013, 08:51

hallo everyone,

i have a problem with the PilchErdman breakup model. I modified the PilchErdmanCoeffs

solveOscillationEq false --> true
B1 0,375 --> 0,01; 0,2;1;2
B2 0,236 --> 0,01; 0,2;1;2

to validate a spray model but the droplets and the spray doen´t varry.

Does anybody know how to influence the coeffs?

Smed · January 24, 2013, 09:22

Are you getting any droplet breakup at all? Is your Weber number in the range that could cause breakup?

azborals · January 24, 2013, 09:44

I Think. Before I calculated by using the ReitzKHRT model. Then I changed to PilchErdmann. I red it should be better for spray modelling. Here are some information about the droplets:

C7H16
dropletsize: d = 0 ...2e-4 m
velocity: u = 20 ... 40 m/s

--> there must be any droplet breakup!?

Is there anything to activate if using PilchErdmann in addition to the selection of the model? Do you know something about the value of the coeffs?

Smed · January 24, 2013, 09:58

Yeah, that should definitely undergo breakup and it looks like your input is correct. Perhaps this bug could be the problem?
http://www.cfd-online.com/Forums/ope...kup-model.html

azborals · January 24, 2013, 10:23

This should be the reason. The first one is the source code of my opanfoam release. Thank You!!! Do you know in which folder I have to do "wmake" to compile?

Smed · January 24, 2013, 10:33

The PilchErdman model is in OpenFOAM-2.x.x/src/lagrangian/spray/submodels/BreakupModel/PilchErdman , so as long as you use one of the Allwmake scripts above that directory, it will recompile the contents of that directory. I would run Allwmake from /src/lagrangian.

azborals · January 24, 2013, 10:57

Thanks! I will try it and give a feedback!

azborals · January 30, 2013, 08:53

It works!!! Thank you!

January 24, 2013, 08:51	problems with PlichErdman breakup model	#1
azborals New Member André Zboralski Join Date: Jan 2013 Posts: 11 Rep Power: 13	hallo everyone, i have a problem with the PilchErdman breakup model. I modified the PilchErdmanCoeffs solveOscillationEq false --> true B1 0,375 --> 0,01; 0,2;1;2 B2 0,236 --> 0,01; 0,2;1;2 to validate a spray model but the droplets and the spray doen´t varry. Does anybody know how to influence the coeffs?

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January 24, 2013, 09:22		#2
Smed Member Adam Join Date: Jun 2011 Posts: 32 Rep Power: 14	Are you getting any droplet breakup at all? Is your Weber number in the range that could cause breakup?

January 24, 2013, 09:44		#3
azborals New Member André Zboralski Join Date: Jan 2013 Posts: 11 Rep Power: 13	I Think. Before I calculated by using the ReitzKHRT model. Then I changed to PilchErdmann. I red it should be better for spray modelling. Here are some information about the droplets: C7H16 dropletsize: d = 0 ...2e-4 m velocity: u = 20 ... 40 m/s --> there must be any droplet breakup!? Is there anything to activate if using PilchErdmann in addition to the selection of the model? Do you know something about the value of the coeffs?

January 24, 2013, 09:58		#4
Smed Member Adam Join Date: Jun 2011 Posts: 32 Rep Power: 14	Yeah, that should definitely undergo breakup and it looks like your input is correct. Perhaps this bug could be the problem? http://www.cfd-online.com/Forums/ope...kup-model.html

January 24, 2013, 10:23		#5
azborals New Member André Zboralski Join Date: Jan 2013 Posts: 11 Rep Power: 13	This should be the reason. The first one is the source code of my opanfoam release. Thank You!!! Do you know in which folder I have to do "wmake" to compile?

January 24, 2013, 10:33		#6
Smed Member Adam Join Date: Jun 2011 Posts: 32 Rep Power: 14	The PilchErdman model is in OpenFOAM-2.x.x/src/lagrangian/spray/submodels/BreakupModel/PilchErdman , so as long as you use one of the Allwmake scripts above that directory, it will recompile the contents of that directory. I would run Allwmake from /src/lagrangian.

January 24, 2013, 10:57		#7
azborals New Member André Zboralski Join Date: Jan 2013 Posts: 11 Rep Power: 13	Thanks! I will try it and give a feedback!

January 30, 2013, 08:53		#8
azborals New Member André Zboralski Join Date: Jan 2013 Posts: 11 Rep Power: 13	It works!!! Thank you!