-
-
August 6, 2018 at 8:38 am
DEBA
SubscriberRespected Sir/Madam
I am trying to do a 2d blood flow model .PERIPHERIAL REGEION IS NEWTONIAN AND CORE REGEION IS NON-NEWTONIAN ( I AM USING CASSON MODEL).
MY QUERY
1) WHICH METHOD SHOULD I USE ?
2) HOW I WILL DIVIDE THIS TWO REGEION & HOW I WILL PROCEED TWO MODEL TWO FLUID FLOW TO GATHER ( NEWTONIAN AND CASSON)
3) HOW I WILL DEFINE IN FLUENT CASSON FOR CORE REGEION AND NEWTONIAN FOR PERIPHERIAL REGEION PLEASE HELP
-
August 6, 2018 at 11:51 am
Rob
Ansys EmployeeHi,
It's not usual to try and set viscosity to use different models in the same zone: how do you intend to match the values between the core and peripheral sections? I'd suggest looking through some of the references to see what others have done: I've used the Casson & Carreau-Yasuda models simulate blood in a variety of systems.
Cheers,
Rob
-
August 6, 2018 at 12:44 pm
Raef.Kobeissi
SubscriberI agree with Rob, check the Casson & Carreau-Yasuda model.
Regards
-
August 6, 2018 at 12:56 pm
Rob
Ansys EmployeeTo clarify (rather than editing my earlier comment), it's two models: Casson and separately Carreau-Yasuda. Both are valid but there's some debate in literature over whether you apply one or other to venous or arterial flows, I wouldn't use both at once!
-
August 7, 2018 at 5:47 am
DEBA
Subscriberactually sir i have written udf code for casson model i want use casson model
My aim is to see dispersion phenomenon. As you have mentioned sir you have worked on casson & Carreau-Yasuda model .if you please give me paper and refernce it will be helpful to me.
-
August 7, 2018 at 5:49 am
DEBA
SubscriberSir My aim is to see dispersion phenomenon,sir i have written udf code for casson model i want use casson model..if you please give me paper and refernce it will be helpful to me.
-
August 7, 2018 at 9:47 am
Rob
Ansys EmployeeCasson model is fine. You don't need to set the viscosity near the wall, the velocity profile (and shear) should push the model towards one of the limits. Just make sure there is a good near wall mesh using inflation layers to get the most out of the viscosity model.
Hopefully this is enough to help, and the community can assist further: as ANSYS staff we're very limited in our support scope beyond general assistance with the software and this is starting to get a bit too specific for the staff team.
-
August 14, 2018 at 5:36 am
DEBA
SubscriberSir my main query is that " How will i use for flow simultanously upper layer newtonian and lower layer non newtonian " please help this
-
August 14, 2018 at 7:47 am
DrAmine
Ansys EmployeeHow are the regions / layers separated from on another?
-
August 14, 2018 at 8:15 am
DEBA
SubscriberSir i have attached picture here .I am trying to do model as blood as two phase .From axis 80% radius ( plug & core) behaves as Non Newtonian region due to suspension of RBC in plasma. And from 80% it behaves like Newtonian fluid.Property of Newtonian fluid known to me and for non newtonian fluid i have written udf.
My question to you how i put property in different layer that is non Newtonian property in non Newtonian region and Newtonian property in Newtonian region means how i will define property in two
different zone and simulate
-
August 14, 2018 at 8:29 am
DrAmine
Ansys EmployeeIf the layers are separated from one another then you can assign each layer its own material. If the layer are not separated and the regions would diffuse or mix with another then you can use a species transport model be defining a mixture of all three materials. the viscosity of the mixture would be then set as harmonic average or volume weighted mixing.
-
- You must be logged in to reply to this topic.

Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
-
2706
-
2142
-
1355
-
1144
-
462
© 2023 Copyright ANSYS, Inc. All rights reserved.