# Calculate swirl number Converge

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 February 15, 2022, 03:21 Calculate swirl number Converge #1 New Member   velkon123 Join Date: Jan 2020 Posts: 14 Rep Power: 4 Hello, How can you calculate the swirl number in ConvergeCFD. I am not sure how to set up the "perform integration" menu. In addition, I was planning to use the following equations but I was doubting if vtan is understood as v_mag or as v_u or v_v when the axial direction is in the z-direction.

 February 17, 2022, 09:59 #2 Senior Member     Kislaya Srivastava Join Date: Sep 2017 Location: Convergent Science, Northville MI Posts: 126 Rep Power: 6 Greetings, CONVERGE outputs dynamic.out which contains information on Swirl Ratio and Angular Momentum in each direction. dynamic_region*.out values are region-based. By default, the swirl axis is the Z axis. However, you can enable Case Setup > Output/Post-Processing > Output files > Dynamic output options and provide a rotation matrix to change your reference vectors. Using this option, you can also enable the output of Angular Momentum Flux across a region interface. These results should help you obtain what you're looking for. Hope this helps. Sincerely, __________________ Kislaya Srivastava Senior Research Engineer | Applications CONVERGECFD

February 26, 2022, 03:36
#3
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velkon123
Join Date: Jan 2020
Posts: 14
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Quote:
 Originally Posted by ksrivast Greetings, CONVERGE outputs dynamic.out which contains information on Swirl Ratio and Angular Momentum in each direction. dynamic_region*.out values are region-based. By default, the swirl axis is the Z axis. However, you can enable Case Setup > Output/Post-Processing > Output files > Dynamic output options and provide a rotation matrix to change your reference vectors. Using this option, you can also enable the output of Angular Momentum Flux across a region interface. These results should help you obtain what you're looking for. Hope this helps. Sincerely,
Dear Ksrivast,
Thank you for your response. I am still wondering however how to calculate the axial momentum for determining the swirl number. In addition, should you provide a rotation matrix in the dynamic output options which is in axial direction?

March 7, 2022, 04:46
#4
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velkon123
Join Date: Jan 2020
Posts: 14
Rep Power: 4
Quote:
 Originally Posted by velkon Dear Ksrivast, Thank you for your response. I am still wondering however how to calculate the axial momentum for determining the swirl number. In addition, should you provide a rotation matrix in the dynamic output options which is in axial direction?
Hi does anybody know how to calculate the swirl number or the axial momentum using Converge?

 March 7, 2022, 10:07 #5 Senior Member     Kislaya Srivastava Join Date: Sep 2017 Location: Convergent Science, Northville MI Posts: 126 Rep Power: 6 Greetings, Swirl is by default calculated wrt to the Z-axis in dynamic.out. If you want to calculate it along an axis inclined to the Cartesian axes, then you'll have to provide a dynamic rotation matrix through dynamic.in. You can consider the following strategies to evaluate axial momentum over a volume: 1. From your 3D files and using a post processing tool, like Tecplot for CONVERGE, you can integrate density*(vel_axial_direction)*cell_volume over the entire volume. 2. You can consider adopting a UDF approach to calculate and output axial momentum as required. To get a rough idea of axial momentum at a particular location, you can have a region interface (two different regions on either side) and use the regions_flow.out file to evaluate momentum across the region interface. The velocity in the regions_flow.out file is along the normal direction. So you can align your region interface accordingly. Hope this helps. If not, please reach out to us at support@convergecfd.com. Please use your official email for all correspondence with Convergent Science. Please mention your request, attach your case setup and add the cfd-online thread, as reference. Sincerely, __________________ Kislaya Srivastava Senior Research Engineer | Applications CONVERGECFD

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