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How to apply two or more interpolation schemes when using Topology Optimization node with COMSOL 5.4

Posted 2019年1月15日 GMT+1 12:47OptimizationVersion 5.42 Replies

H. LI
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Dear Mr./Mrs.,

The latest COMSOL 5.4 version has integrated the Topolgy optimization node in "definition". The filter as well as the projection can be accessed more conveniently compared with previous versions.

My question is:How to apply two or more interpolation schemes when using Topology Optimization node with COMSOL 5.4?

That is because in some fluidic-thermal topology optimization problems, I need to use different interpolation schemes for different physical properties. For example, I want to use Darcy penalization for body force terma, and to use RAMP penalization for thermal conductivity.

On the other hand, is it possible to self-define the interpolation scheme by using the built-in topology optimization node?

Hope to hear from you guys soon.

Kindly regards, Hao LI

2 Replies Last Post 2019年1月15日 GMT+1 14:19
Kristian Ejlebjærg Jensen COMSOL Employee

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Posted: 7 years ago 2019年1月15日 GMT+1 13:34
Updated: 7 years ago 2019年1月15日 GMT+1 13:35

Hi Hao

You can usedtopo1.thetato write your own interpolation function, i.e. you pick Darcy interpolation and write a custom RAMP expression usingdtopo1.thetafor the thermal conductivity, while you usedtopo1.theta_pfor the damping term.

dtopo1.theta_palready contains the interpolation, so you only have to multiply it with the maximum damping (units ofPa s/m^2)

best, kristian

Hi Hao You can use *dtopo1.theta* to write your own interpolation function, i.e. you pick Darcy interpolation and write a custom RAMP expression using *dtopo1.theta* for the thermal conductivity, while you use *dtopo1.theta_p* for the damping term. *dtopo1.theta_p* already contains the interpolation, so you only have to multiply it with the maximum damping (units of *Pa s/m^2*) best, kristian
H. LI
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Posted: 7 years ago 2019年1月15日 GMT+1 14:19

Hi Hao

You can usedtopo1.thetato write your own interpolation function, i.e. you pick Darcy interpolation and write a custom RAMP expression usingdtopo1.thetafor the thermal conductivity, while you usedtopo1.theta_pfor the damping term.

dtopo1.theta_palready contains the interpolation, so you only have to multiply it with the maximum damping (units ofPa s/m^2)

best, kristian

Hi Kristian,

Thanks for your timely reply.

Following your comments, is that means the helmoltz filter together with the tanh projection will work for both Darcy and RAMP interpolation? So I do not need to define an extra PDE and analytical function to apply the filter and projection for RAMP interpolation?

kindly regards, Hao

>Hi Hao > >You can use *dtopo1.theta* to write your own interpolation function, i.e. you pick Darcy interpolation and write a custom RAMP expression using *dtopo1.theta* for the thermal conductivity, while you use *dtopo1.theta_p* for the damping term. > >*dtopo1.theta_p* already contains the interpolation, so you only have to multiply it with the maximum damping (units of *Pa s/m^2*) > >best, >kristian Hi Kristian, Thanks for your timely reply. Following your comments, is that means the helmoltz filter together with the tanh projection will work for both Darcy and RAMP interpolation? So I do not need to define an extra PDE and analytical function to apply the filter and projection for RAMP interpolation? kindly regards, Hao

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