Help needed for writing CEL expression

kmgraju · September 18, 2010, 16:55

dear all

I am facing difficulties in writing CEL expression for my problem

Please see the attached expressions
here a,b,c, and d are constants .but it is not valid if i write the expression in exponential form. Kindly explain to me
but if I introduce [s^-1] for all constants I am getting plot.
and in the final expression also i am facing difficulties . Please help me. what mistake I did?
Thanks in advance
kmgraju

ghorrocks · September 19, 2010, 06:59

Obviously you need to use units s^-1 for the expression to be valid. Expressions like exp and ^ need unitless inputs. Hopefully you can work it out from there.

kmgraju · September 19, 2010, 10:58

Thank you for your valuable guidelines
Actually I am trying to do the analysis of non Newtonian fluid flow.
I tried to do tutorial problem Non Newtonian fluid flow in an annulus
I didn't find other models other than Sutherlands Formula . I could not find Ostwald de Waele model as stated in the tutorial problems
Please help me where can I find this information or is the installation not full?
I also couldn't find other models like Bird Carreau,Casson and so on
Thank you so much

kmgraju

ghorrocks · September 19, 2010, 19:49

All those models are in there. Set Kin Viscosity to Non-Newtonian and those options become available.

kmgraju · September 20, 2010, 03:49

Dear Mr. Glenn Horrocks

I am using ANSYS CFX 11. I have attached the front screen for your kind perusal. I couldn't find non Newtonian fluid option

Thanks in advance
Govind

ghorrocks · September 20, 2010, 19:30

Then either it was introduced in V12 or you need an upgraded license to access it. Not sure which. Either way it is time for an upgrade. Talk to CFX support.

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September 19, 2010, 06:59		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,889 Rep Power: 144	Obviously you need to use units s^-1 for the expression to be valid. Expressions like exp and ^ need unitless inputs. Hopefully you can work it out from there.

September 19, 2010, 10:58		#3
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	Thank you for your valuable guidelines Actually I am trying to do the analysis of non Newtonian fluid flow. I tried to do tutorial problem Non Newtonian fluid flow in an annulus I didn't find other models other than Sutherlands Formula . I could not find Ostwald de Waele model as stated in the tutorial problems Please help me where can I find this information or is the installation not full? I also couldn't find other models like Bird Carreau,Casson and so on Thank you so much kmgraju

September 19, 2010, 19:49		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,889 Rep Power: 144	All those models are in there. Set Kin Viscosity to Non-Newtonian and those options become available.

September 20, 2010, 19:30		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,889 Rep Power: 144	Then either it was introduced in V12 or you need an upgraded license to access it. Not sure which. Either way it is time for an upgrade. Talk to CFX support.