non-newtonian model

alinematollahi · October 5, 2010, 07:01

Hi
I'm going to a non-Newtonian models for blood do I use the models caro and casson. When the models for the following phrases (in cfx expression language)and I'll solve the problem, not a correct answer that it review the resulting graphs can be realized. When the models in the software I use, firstly when entering model casson and begin to solve it is removed from the solver and Gives the following message. Do phrases are correctly expressed? And how do I use casson model?
casson model in CEL

sqrt(tawy/abs(min(uppers,max(sstrnr,lowers))))+sqrt(miuc))^2
tawy:6.7253e-04[kg m^-1 s^-2]
miuc:0.008[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
caro model in CEL:miubin+((miuzero-miubin)*(1+(a*((min(uppers,max(sstrnr,lowers))) ^2)))^n)
miubin:0.007888[kg m^-1 s^-1]
miuzero:0.12805[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
error in casson (Models in software):
Details of error:-
----------------
Error detected by routine DELDIR
CDRNAM = get_VISCDYN
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM
Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = LVAR CDTYPE = INTR ISIZE = 77
CRESLT = OLD

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES
thank you very much

michael_owen · October 6, 2010, 17:57

Quote:

Originally Posted by alinematollahi

Hi
I'm going to a non-Newtonian models for blood do I use the models caro and casson. When the models for the following phrases (in cfx expression language)and I'll solve the problem, not a correct answer that it review the resulting graphs can be realized. When the models in the software I use, firstly when entering model casson and begin to solve it is removed from the solver and Gives the following message. Do phrases are correctly expressed? And how do I use casson model?
casson model in CEL

sqrt(tawy/abs(min(uppers,max(sstrnr,lowers))))+sqrt(miuc))^2
tawy:6.7253e-04[kg m^-1 s^-2]
miuc:0.008[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
caro model in CEL:miubin+((miuzero-miubin)*(1+(a*((min(uppers,max(sstrnr,lowers))) ^2)))^n)
miubin:0.007888[kg m^-1 s^-1]
miuzero:0.12805[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
error in casson (Models in software):
Details of error:-
----------------
Error detected by routine DELDIR
CDRNAM = get_VISCDYN
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM
Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = LVAR CDTYPE = INTR ISIZE = 77
CRESLT = OLD

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES
thank you very much

This is a bug. I have run into it. When you attempt to use one of the built in non-Newtonian viscosity models, it is not calculating the Dynamic Viscosity. You will have to create the model from CEL and just enter in the Dynamic Viscosity field in the material definition. I had to do this for the Cross model. Luckily all of the equations for the various models are well documented, so they are easy to recreate.

alinematollahi · October 19, 2010, 06:09

thank you michael_owen
Please you are right. But when casson model in its software that I use the numbers assigned to give error messages
tawy:6.7253e-04[kg m^-1 s^-2]
miuc:0.008[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
error in casson (Models in software):
Details of error:-
----------------
Error detected by routine DELDIR
CDRNAM = get_VISCDYN
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM
Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = LVAR CDTYPE = INTR ISIZE = 77
CRESLT = OLD

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES
thank you very much

alinematollahi · October 19, 2010, 06:09

thank you michael_owen
Please you are right. But when casson model in its software that I use the numbers assigned to give error messages
tawy:6.7253e-04[kg m^-1 s^-2]
miuc:0.008[kg m^-1 s^-1]
uppers:300[s^-1]
lowers:0.00001[s^-1]
error in casson (Models in software):
Details of error:-
----------------
Error detected by routine DELDIR
CDRNAM = get_VISCDYN
CRESLT = NONE

Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM
Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = LVAR CDTYPE = INTR ISIZE = 77
CRESLT = OLD

Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES
thank you very much

berelian90 · October 19, 2010, 07:39

Dear Mr. nematollahi,
are you from iran?
i have used ansys cfx 12 for modeling an artery bifurcation in fsi
and i will be so grateful if you help me.
this is my email address:
zahra_farashah@yahoo.com

October 5, 2010, 07:01	non-newtonian model	#1
alinematollahi New Member ali Join Date: Jun 2010 Posts: 15 Rep Power: 15	Hi I'm going to a non-Newtonian models for blood do I use the models caro and casson. When the models for the following phrases (in cfx expression language)and I'll solve the problem, not a correct answer that it review the resulting graphs can be realized. When the models in the software I use, firstly when entering model casson and begin to solve it is removed from the solver and Gives the following message. Do phrases are correctly expressed? And how do I use casson model?</SPAN></SPAN></SPAN> casson model in CELsqrt(tawy/abs(min(uppers,max(sstrnr,lowers))))+sqrt(miuc))^2 tawy:6.7253e-04[kg m^-1 s^-2] miuc:0.008[kg m^-1 s^-1] uppers:300[s^-1] lowers:0.00001[s^-1] caro model in CEL:miubin+((miuzero-miubin)(1+(a((min(uppers,max(sstrnr,lowers))) ^2)))^n) miubin:0.007888[kg m^-1 s^-1] miuzero:0.12805[kg m^-1 s^-1] uppers:300[s^-1] lowers:0.00001[s^-1] error in casson (Models in software): Details of error:- ---------------- Error detected by routine DELDIR CDRNAM = get_VISCDYN CRESLT = NONE Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM Details of error:- ---------------- Error detected by routine MAKDAT CDANAM = LVAR CDTYPE = INTR ISIZE = 77 CRESLT = OLD Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES thank you very much

October 19, 2010, 06:09	non-newtonian fluid-casson model	#4
alinematollahi New Member ali Join Date: Jun 2010 Posts: 15 Rep Power: 15	thank you michael_owen Please you are right. But when casson model in its software that I use the numbers assigned to give error messages tawy:6.7253e-04[kg m^-1 s^-2] miuc:0.008[kg m^-1 s^-1] uppers:300[s^-1] lowers:0.00001[s^-1] error in casson (Models in software): Details of error:- ---------------- Error detected by routine DELDIR CDRNAM = get_VISCDYN CRESLT = NONE Current Directory : /FLOW/SOLUTION/TSTEP0/CLOOP0/ZN1/VERTICES/GLOBAL/MINIMUM Details of error:- ---------------- Error detected by routine MAKDAT CDANAM = LVAR CDTYPE = INTR ISIZE = 77 CRESLT = OLD Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES thank you very much

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October 19, 2010, 07:39		#5
berelian90 New Member z Join Date: Jan 2010 Posts: 3 Rep Power: 16	Dear Mr. nematollahi, are you from iran? i have used ansys cfx 12 for modeling an artery bifurcation in fsi and i will be so grateful if you help me. this is my email address: zahra_farashah@yahoo.com