Adding moving solid in a flow

lapri94 · January 23, 2018, 06:10

Hello,

I have developed a model of a blood vessel and would like to add a moving tumour cell to study its displacement and deformation.

Is it possible to add a moving solid inside the vessel with Ansys.

Thank you in advance.

Gert-Jan · January 23, 2018, 08:37

Assuming the tumor is of the same size as the blood vessel (vain) then: is the tumor:
1) attached to the vain, so the tumor and the vain deform together?
2) or just transported by the blood through the vain?

For 1): If it is attached to the vain and the displacement and the deformation is limited, you can do this CFX with deforming mesh. If they are large, I would recommend Fluent or Star-CCM+ since you not only need deforming mesh, but also remeshing once in while, which is not possible in CFX.

For 2) Treat it as a DEM particle in Fluent or Star-CCM+.

Regs, Gert-Jan

ghorrocks · January 23, 2018, 16:41

Gert-Jan: Dynamic remeshing is possible in CFX.

Other possible approaches could be lagrangian particle tracking or immersed solids. Which approach is suitable depends on exactly what you expect the tumour to do.

Gert-Jan · January 23, 2018, 17:23

@Glenn. Since when? A few years ago it was impossible......

Indeed, Lagrangian particle tracking and immersed solids are also possible. However, LPT assumes the particle can be regarded as a point mass. So it does not occupy any volume in your simulation. It is very valuable approach for tiny particles, which could be a tumor cell. But if you want to study deformation, it won't add much.

Regarding immersed solids, I am not sure if it makes a valid combination with deforming meshes........... Glenn?

ghorrocks · January 23, 2018, 17:26

CFX has had it for a few versions. It is done through a link with ICEM. There are tutorial examples on the ANSYS Customer webpage.

I do not think immersed solids works with deforming mesh.

Yes, all the approaches have limitations. But until we know the details of what he is modelling we do not know the appropriate model. It is up to lapri to explain the details off what he/she plans to model.

January 23, 2018, 06:10	Adding moving solid in a flow	#1
lapri94 New Member None Join Date: Jan 2018 Posts: 1 Rep Power: 0	Hello, I have developed a model of a blood vessel and would like to add a moving tumour cell to study its displacement and deformation. Is it possible to add a moving solid inside the vessel with Ansys. Thank you in advance.

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January 23, 2018, 08:37		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Assuming the tumor is of the same size as the blood vessel (vain) then: is the tumor: 1) attached to the vain, so the tumor and the vain deform together? 2) or just transported by the blood through the vain? For 1): If it is attached to the vain and the displacement and the deformation is limited, you can do this CFX with deforming mesh. If they are large, I would recommend Fluent or Star-CCM+ since you not only need deforming mesh, but also remeshing once in while, which is not possible in CFX. For 2) Treat it as a DEM particle in Fluent or Star-CCM+. Regs, Gert-Jan

January 23, 2018, 16:41		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Gert-Jan: Dynamic remeshing is possible in CFX. Other possible approaches could be lagrangian particle tracking or immersed solids. Which approach is suitable depends on exactly what you expect the tumour to do.

January 23, 2018, 17:23		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	@Glenn. Since when? A few years ago it was impossible...... Indeed, Lagrangian particle tracking and immersed solids are also possible. However, LPT assumes the particle can be regarded as a point mass. So it does not occupy any volume in your simulation. It is very valuable approach for tiny particles, which could be a tumor cell. But if you want to study deformation, it won't add much. Regarding immersed solids, I am not sure if it makes a valid combination with deforming meshes........... Glenn?

January 23, 2018, 17:26		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	CFX has had it for a few versions. It is done through a link with ICEM. There are tutorial examples on the ANSYS Customer webpage. I do not think immersed solids works with deforming mesh. Yes, all the approaches have limitations. But until we know the details of what he is modelling we do not know the appropriate model. It is up to lapri to explain the details off what he/she plans to model.