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Viscoelastic Fluid Flows using OpenFOAM The solver viscoelasticFluidFoam 

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August 21, 2013, 20:03 

#281 
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胡长旭
Join Date: Aug 2013
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Hi, Thanks a lot. I have solved my question. I am so glad with your help. Thanks again! but now another question is appear. When I calculating the example of viscoelasticFluidFoam, I run this program, code: viscoelasticFluidFoam > log & the results show that: FOAM FATAL TO ARROR: Unkown asymmetric matrix solver BICGSTAB Valid asymmeyric matrix solvers are: ......... what is wrong? Have a nice day! 

August 21, 2013, 21:14 

#282  
Senior Member

Quote:
I didn't hear before about BICGSTAB matrix solver. go to solutionDict and look for which equation you used BICGSTAB solver. change it to a asymmetric matrix solver. it had guid you and had awared you about valid solvers in the last error. 

August 22, 2013, 02:58 

#283  
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胡长旭
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Quote:
Have a nice day! 

August 23, 2013, 02:05 
the same

#284  
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k zhang
Join Date: Jun 2012
Location: China
Posts: 9
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Quote:
How can i get the parameters of the Giesekus Model about one melt through rheological experiments, like etaS, etaP, alfar, lambda. I want to fit the parameters through the polymat module. 

August 23, 2013, 11:13 
ViscoelasticInterFoam

#285 
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Erick Lorenzato
Join Date: Mar 2013
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Hello everyone,
I'm working with viscoelastic fluids in my thesis and i need compile viscoelasticInterFoam Jovani sent me the files. They were: Case (the turorial); Solver (Tutorial  Make folder with; viscoelasticTwoPhaseModels  folder with make, and viscoelasticLaws viscoelasticModel). I tried to install them as the tutorial viscoelasticFluidFoam (http://lists.cfdonline.com/pipermai...er/029862.html). So I can not. Is generating a lot of mistakes. Anyone have any tutorial or way to install it? I put the folders as viscoelasticFluidFoam, but when I do the command Wmake libso && && cd  Generates this error root @ admindesktop: ~ / OpenFOAM/OpenFOAM1.6ext/src/transportModels/viscoelastic viscoelasticTwoPhaseModels # cd / && wmake libso && cd  wmakeLnInclude: linking include files to. / lnInclude make: *** No rule to make target `viscoelasticLaws / DCPP / DCPP.dep ', needed by` Make/linux64GccDPOpt/dependencies'. Stop. Thanks in advance! Erick 

August 26, 2013, 08:31 

#286  
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Sita Drost
Join Date: Mar 2009
Location: Arnhem, The Netherlands
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Quote:
In constant/viscoelasticProperties, you just need to remove the "type multiMode" part and only define one mode. It's all rather straightforward, and I think you can even check the viscoelasticPropertiesfiles in the tutorials; there are both single and multimode tutorials. Furthermore, you need to substitute the taufirst, tausecond, etc. files under 0/ with a single tau file. Good luck, Sita 

August 26, 2013, 08:53 

#287  
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Sita Drost
Join Date: Mar 2009
Location: Arnhem, The Netherlands
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Quote:
I think you should start with a basic rheology textbook. Some good ones are: Dynamics of Polymeric Liquids (Part I and II), by Bird, Armstrong and Hassager, Rheology: Principles, Measurements and Applications, by Macosko, and An Introduction to Rheology, by Barnes, Hutton and Walters. Also very instructive: Constitutive Equations for Polymer Melts and Solutions, by Larson. Good luck, Sita 

August 26, 2013, 09:18 

#288  
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Quote:


August 26, 2013, 10:47 
Weird inlet flow

#289 
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Join Date: Feb 2012
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I ran a case w/ cylinder using OldroydB model and specified the fullydeveloped velocity profile for the inlet and zeroGradient for outlet. The velocity magnitude and streamline was shown in the attache snapshot. It's quite weird to see two circulation zones near the inlet. Any idea for this problem?


August 26, 2013, 21:50 

#290  
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salame ama
Join Date: Dec 2012
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Hi, sita: Thanks! These days, i read some books you recommanded. If take the singlemodle, I think just the alfar should be fitted. is that right? Great regards! salame 

August 27, 2013, 20:08 

#291 
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胡长旭
Join Date: Aug 2013
Posts: 26
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Hello, everyone!
Did anyone who used the SMDCPP model in the OpenFoam. When I using this Model, the result is not good! maybe it is not converage! What is wrong ? Thanks! 

August 27, 2013, 20:13 

#292 
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胡长旭
Join Date: Aug 2013
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Hi ,
Did you use the SMDCPP model in the OpenFoam. When I using this model , the result is poor! Thanks 

August 28, 2013, 07:08 

#293 
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August 28, 2013, 20:28 

#294 
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胡长旭
Join Date: Aug 2013
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Hi, Thanks for youe reply!
When I employing the SMDCPP model to do this case, and I transfer the result file to Tecplot360, the result is serious. For example, U P and Tau. I think the pattern is not steady! Thanks a lot! 

August 28, 2013, 23:46 

#295 
Senior Member

how about the residuals and convergence?


August 29, 2013, 02:12 

#296 
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胡长旭
Join Date: Aug 2013
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Hi
I used the default file. for p is 1*107, and for tau and U is 1*106. The controlDict file is also default. Thanks 

August 29, 2013, 02:13 

#297 
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胡长旭
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August 29, 2013, 05:31 

#298 
Senior Member


August 29, 2013, 19:58 

#299 
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胡长旭
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August 31, 2013, 20:58 
About the SMDCPP model

#300 
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胡长旭
Join Date: Aug 2013
Posts: 26
Rep Power: 4 
Hi, everyone
When I using the SMDCPP model by the default to solve my question, The results of U, P and tau is serious. the pattern is riots. What is wrong with this problem? Maybe you can run it, and check the result. Can anyone help me with this question? Thanks a lot best wishes Have a nice day 

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