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Calculate the length of a flow streamline

Posted Feb 5, 2015, 11:13 p.m. EST Computational Fluid Dynamics (CFD), Microfluidics Version 5.0 5 Replies

Tianhang Bai
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Hi everyone,

Does anybody know how to calculate the length of a streamline that I plot in the post processing? I could export the excel file of the streamline and do the maths in excel, but is there any simple method to do that in comsol?

Thanks.


Tianhang
5 Replies Last Post Aug 17, 2016, 3:56 p.m. EDT
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Hello Tianhang Bai

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Bill
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Posted: 8 years ago Aug 12, 2016, 12:59 p.m. EDT

Hi everyone,

Does anybody know how to calculate the length of a streamline that I plot in the post processing? I could export the excel file of the streamline and do the maths in excel, but is there any simple method to do that in comsol?

Thanks.


Tianhang

Hi, have you found the simple way to do the calculation? Would you please give me some infromation?
Thank you in advance.
BestRegards,
Bill
[QUOTE] Hi everyone, Does anybody know how to calculate the length of a streamline that I plot in the post processing? I could export the excel file of the streamline and do the maths in excel, but is there any simple method to do that in comsol? Thanks. Tianhang [/QUOTE] Hi, have you found the simple way to do the calculation? Would you please give me some infromation? Thank you in advance. BestRegards, Bill
Sohan Birla
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Posted: 8 years ago Aug 12, 2016, 1:57 p.m. EDT
You can indirectly do measurement on a interpolation curve drawn using streamline coordinates obtained from exported data of the streamline plot.
You can indirectly do measurement on a interpolation curve drawn using streamline coordinates obtained from exported data of the streamline plot.
Bill
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Posted: 8 years ago Aug 16, 2016, 3:43 a.m. EDT
Hi Dr. Birla,
Thank you for the reply.
I have found the way to calculate the arch length of the streamline.
One problem is that, I have hundreds of cases that need to be handled with. I wonder if there is some simple way to do this. As it costs a lot of time to export the streamline plot data.
Thank you for any suggestions.
Best Regards,
Bill
Hi Dr. Birla, Thank you for the reply. I have found the way to calculate the arch length of the streamline. One problem is that, I have hundreds of cases that need to be handled with. I wonder if there is some simple way to do this. As it costs a lot of time to export the streamline plot data. Thank you for any suggestions. Best Regards, Bill
Gunnar Andersson COMSOL Employee

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Posted: 8 years ago Aug 16, 2016, 5:06 a.m. EDT
One problem is that, I have hundreds of cases that need to be handled with. I wonder if there is some simple way to do this. As it costs a lot of time to export the streamline plot data.


The export feature can measure the length for you:
1. Create a Plot export feature that points to your streamline plot.
2. Check the "Only export start and end points" check box.
3. Browse to some output file.
4. Export.
5. Open the output file: There's one row for each streamline. It contains the start point, the end point, and the length of the streamline.


[QUOTE]One problem is that, I have hundreds of cases that need to be handled with. I wonder if there is some simple way to do this. As it costs a lot of time to export the streamline plot data.[/QUOTE] The export feature can measure the length for you: 1. Create a Plot export feature that points to your streamline plot. 2. Check the "Only export start and end points" check box. 3. Browse to some output file. 4. Export. 5. Open the output file: There's one row for each streamline. It contains the start point, the end point, and the length of the streamline.
Bill
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Posted: 8 years ago Aug 17, 2016, 3:56 p.m. EDT
Dear Dr. Andersson,
Thank you for the reply.
I did exactly as what you have suggested. It works.
Thank you very much.
Dear Dr. Andersson, Thank you for the reply. I did exactly as what you have suggested. It works. Thank you very much.

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