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| # LES Filtering & Vortical Structures | ||
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| This program is used for two purpose. | ||
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| First it is applied to filter the fully-developed channel DNS data ( Re_tau = 395 ). Gaussian filter is used to filter DNS data. | ||
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| Second it is used to get vortical structures from three different identification schemes | ||
| - Q criteria ( Haller.1988 ) | ||
| - Lambda_2 criteria ( Jeong.1995 ) | ||
| - Lambda_ci criteria ( Zhou.1999 ) | ||
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| Related report is posted on https://www.dropbox.com/s/3b180nsfyvw7gkj/report.pdf?dl=0. | ||
| Example data for DNS_data is posted on https://www.dropbox.com/s/241nuubybzb8tgg/instantaneous_velocity_field_re644.plt?dl=0. This data's size is about 2 GB. | ||
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| ### 1. Setting for LES_Filtering code | ||
| - Make 'RESULT' folder | ||
| - Add 3D Velocity data (u,v,w in x,y,z direction) ( tecplot format ) to RESULT folder | ||
| - Change settings in LES_Filtering_setup.f90 code only | ||
| - Set file name variable ( file_name ) | ||
| - Set the number of meshes ( Nx,Ny,Nz ) | ||
| - Set the filter width constant ( FW ) | ||
| - Set Y-slice point ( N,YP ) | ||
| - Set Statistic type ( VS_ONLY ) | ||
| - Set vortical structure identification scheme ( VS_CASE ) | ||
| - Set the number of filter ( FILTER_OX ) | ||
| - If you want to make only vortical structure, set Filter_OX = 0, VS_ONLY = 2 | ||
| - If you want to get eddy viscosity and Smargorinsky coefficient, set FILTER_OX =2, VS_ONLY = 0 or 1. | ||
| - Set Y sorting order ( Y_ORDER) | ||
| - Whether the Y is saved in ascending or descending order. | ||
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| ### 2. Output files | ||
| - Filtered mean velocities ( 3D field, Y slice contour, Y profile ) | ||
| - Filtered residual stress ( Y slice contour, Y profile ) | ||
| - Filtered strain rate ( Y slice contour, Y profile ) | ||
| - Filtered rotation rate ( Y slice contour, Y profile ) | ||
| - Filtered eddy viscosity ( Y slice contour, Y profile ) | ||
| - Filtered Smargorinsky coefficient ( Y slice contour, Y profile ) | ||
| - Vortical Structures | ||
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| ### 3. Code composition | ||
| - LES_filtering_main.f90 | ||
| - LES_filtering_module.f90 | ||
| - LES_filtering_setup.f90 | ||
| - LES_filtering_read.f90 | ||
| - LES_filtering_filter.f90 | ||
| - LES_filtering_second_filter.f90 | ||
| - LES_filtering_output.f90 | ||
| - LES_filtering_eig33.f90 | ||
| - Vortical_Structures.f90 |