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Forum: CFX

June 13, 2018, 02:50

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Suggestion on new dynamic viscosity expression in CFX

Hi, floating error could be due to anything including poor meshing as well transient solution setup.
Again looking at your values, nu0 is too small and tau0 is too large. I think you have...

Forum: CFX

June 5, 2013, 07:03

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Hi Glenn The viscosity equation I wrote after...

Hi Glenn
The viscosity equation I wrote after cross-checking the units, should have been

dynvis = (1-exp(nu0*Bounded_sstrnr/tau0)) * ((tau0/Bounded_sstrnr)+K*Bounded_sstrnr^(n-1))

instead of...

Forum: CFX

June 3, 2013, 09:34

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Lance, the density has always been 1000kgm^-3,...

Lance, the density has always been 1000kgm^-3, however, I do not know how it became so low in the output file. Maybe it could be due to the 'bounded' problem I was facing earlier.

Forum: CFX

June 3, 2013, 08:52

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Thanks Glenn and Lance for your help. Problem...

Thanks Glenn and Lance for your help. Problem solved!!!
Now the Reynolds number is completely laminar and no error message as before. I'm very grateful to you all. I love this forum.

Domain...

Forum: CFX

June 3, 2013, 08:27

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Thanks Glenn for the quick reply. I'll sort out...

Thanks Glenn for the quick reply. I'll sort out the units

Forum: CFX

June 3, 2013, 08:24

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Thanks alot Lance. I'll check the results and...

Thanks alot Lance. I'll check the results and give you feedback

Forum: CFX

June 3, 2013, 08:08

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Hi Glenn, one more thing. Please find attached a...

Hi Glenn, one more thing. Please find attached a plot of dynamic viscosity vs. shear rate (gamma from 1E-10 to 1E-01). It can be seen that for shear rate of 1E-10 and below, the dynamic viscosity is...

Forum: CFX

June 3, 2013, 06:32

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Thanks Glenn. Very informative.

Thanks Glenn. Very informative.

Forum: CFX

June 3, 2013, 00:02

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Hi Glenn, this is the error message I used to get...

Hi Glenn, this is the error message I used to get any time I run with the defined dynamic viscosity:

(1-exp(nu0*sstrnr/tau0))+((tau0/sstrnr)+K*sstrnr^(n-1))

...

Forum: CFX

June 2, 2013, 00:08

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Glenn, thanks for the reply. BTW is there any...

Glenn, thanks for the reply.
BTW is there any way I can get access to the existing code for Herschel-Bulkley viscosity in ANSYS CFX 14.0 and then modify it as a UDF?

Thanks again

Titus

Forum: CFX

May 31, 2013, 10:10

Replies: 25

Suggestion on new dynamic viscosity expression in CFX

Views: 6,198

Posted By TitusOfei

Suggestion on new dynamic viscosity expression in CFX

Dear friends,
I am using ANSYS CFX version 14.0 and I want to model a different non-Newtonian fluid dynamic viscosity other than those provided in CFX. I wish to write them in either CEL or CCL (I...

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