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Applying cylindrical coordinate system in comsol

Posted 2023年3月23日 GMT+1 06:49Version 5.64 Replies

M Gnanasekaran
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I am studying a 3d transient model to understand the effect of combined Buoyancy-Marangoni convection in a cylindrical geometry. I want to apply the cylindrical coordinates (r, θ, a). As a solution to this, I have changed the default cartesian system (x, y,z) to cylindrical coordinates under component< definitons

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4 Replies Last Post 2023年3月27日 GMT+2 17:19
M Gnanasekaran
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Posted: 1 year ago 2023年3月23日 GMT+1 06:50

I have attached a doc file that contains my doubts with images.Please go through it and suggest me some solutions.

Thank You

I have attached a doc file that contains my doubts with images.Please go through it and suggest me some solutions. Thank You
Henrik Sönnerlind COMSOL Employee

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Posted: 1 year ago 2023年3月23日 GMT+1 16:04

The local coordinate system in theFluidnode is only used to interpret the inputs (that is,Velocity Fieldand possibly a nonisotropicThermal Conductivity).

If you want to transform the velocity into a local coordinate system, you can use theVector Transformnode, found underDefinitions->Variable Utilities.

As for your second question, it is better if you can upload your model (or a similar one).

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Henrik Sönnerlind
COMSOL
The local coordinate system in the *Fluid* node is only used to interpret the inputs (that is, *Velocity Field* and possibly a nonisotropic *Thermal Conductivity*). If you want to transform the velocity into a local coordinate system, you can use the *Vector Transform* node, found under *Definitions* -> *Variable Utilities*. As for your second question, it is better if you can upload your model (or a similar one).
M Gnanasekaran
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Posted: 1 year ago 2023年3月27日 GMT+2 07:47

Thank you for your kind suggestions.

I have used the vector transform node like you suggested. But unfortunatley I still get results in x,y,z coorinates. Can u please where I made a mistake?. I have attached the images.

Thank you for your kind suggestions. I have used the vector transform node like you suggested. But unfortunatley I still get results in x,y,z coorinates. Can u please where I made a mistake?. I have attached the images.

Attachments:

Henrik Sönnerlind COMSOL Employee

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Posted: 1 year ago 2023年3月27日 GMT+2 17:19

a) You have not selected any input inVector Transform. You should select the velocity vector there.
b) The result to be displayed is the variable created inVector Transform; a name that you choose.

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Henrik Sönnerlind
COMSOL
a) You have not selected any input in *Vector Transform*. You should select the velocity vector there. b) The result to be displayed is the variable created in *Vector Transform*; a name that you choose.

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