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How to model viscous fluid in ABAQUS

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tahunter
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(@tahunter)
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Joined: 12 years ago

I have a beam which is moving according to a dynamic force. In the environment where the beam is moving there is fluid. Therefore, viscous force is exerted to the beam due to the viscosity of the fluid. Now, I would like to implement the viscosity of the fluid in the model so that the beam senses the fluid. What is the easiest way for doing that?

I thought about using the viscous damping which is normally used as the stabilizer of the solution? But I was not sure if the net effect is going to be the same as a real viscous force. Besides, when I use Dynamic, implicit type of analysis there is no place where I can define any damping for the solution. Is there any other easy solution for this problem?

Thank you in advance for your time.

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Jorgen
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It certainly would be convenient to use the standard viscous damping stabilization. I am not sure, however, if that will give you accurate results.

Another option would be to mesh the fluid and then assign appropriate viscoelastic behavior to that fluid.

-Jorgen

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Ashay158
(@ashay158)
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@jbrektor I saw some of your comments on abaqus viscous modelling. I am new to abaqus modelling and I am currently working on modelling a viscoelastic Asthenosphere in a subduction zone model. I looked at the abaqus inbuilt viscoelastic material parameters and I don't have any prony series constants or stress relaxation data. Do you have any suggestions on how can I model a viscoelastic Asthenosphere with default abaqus material model? or will I have to write a user subroutine for this?

Thank you,

Ashay Panse.

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v_katkar@incat.com
Posts: 24
(@v_katkar@incat.com)
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Joined: 15 years ago

Hi,

In additions to Dr. Jorgans reply you may also run co-simulaiton Analaysis in Abaqus 6.10 in which you can couple Abaqus/Standard and /CFD.

Shripad

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