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Copy file name to clipboardExpand all lines: _vandv/30p30n.md
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@@ -29,7 +29,7 @@ The SA-noft2 turbulence model was used with first order advection, the convectiv
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## Mesh Description
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Structured meshes of increasing density are used to perform a grid convergence study. The meshes are 2D SU2 versions of the publicly available [2.5D APC-IV JAXA grids](https://cfdws.chofu.jaxa.jp/apc/grids/3element_highlift_airfoil/30P30N_modified_slat_configF/cgns/).
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The SU2 versions can be downloaded from the [SU2 V&V GitHub repository]().
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The SU2 versions can be downloaded from the [SU2 V&V GitHub repository](https://github.com/su2code/VandV/tree/master/rans/30p30n).
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The mesh designations and approximate sizes are:
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- L1 "coarse" (2 x "fine") - 64k quadrilaterals
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We observe second order convergence of the lift and drag coefficients, and good agreement between Roe + van Albada, JST, [FaSTAR results](https://jaxa.repo.nii.ac.jp/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=2921&item_no=1&page_id=13&block_id=21), and [Cflow results](https://jaxa.repo.nii.ac.jp/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=2923&item_no=1&page_id=13&block_id=21).
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The Roe + Venkatakrishnan configuration predicts lower values, which were observed to be sensitive to the limiter coefficient. For example lowering it to 0.025 increases drag above the values obtained with the other two configurations.
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<palign="center">
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<palign="right">
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<imgsrc="/vandv_files/30p30n/drag.png"alt="Drag coefficient at 5.5deg AoA" />
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</p>
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Drag coefficient at 5.5deg AoA.
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<palign="center">
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<palign="righy">
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<imgsrc="/vandv_files/30p30n/lift.png"alt="Lift coefficient at 5.5deg AoA" />
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</p>
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Lift coefficient at 5.5deg AoA
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Roe + van Albada and JST agree well on the maximum lift, and again match the results of other codes.
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However JST predicts the flow to remain attached at significantly higher angle-of-attach than expected.
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<palign="center">
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<palign="right">
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<imgsrc="/vandv_files/30p30n/max_lift.png"alt="Lift coefficient on the fine grid level" />
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</p>
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Lift coefficient on the fine grid level
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<palign="center">
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<palign="right">
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<imgsrc="/vandv_files/30p30n/max_drag.png"alt="Drag coefficient on the fine grid level" />
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</p>
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Drag coefficient on the fine grid level
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Away from this critical point the lift and drag characteristics are dominated by the pressure distribution and thus the two schemes agree well.
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The only significant differences in Cf between the van Albada and Venkatakrishnan limiters are at the trailing-edges.
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<imgsrc="/vandv_files/30p30n/cp.png"alt="Pressure coefficient distribution at 5.5deg AoA on fine grid level" />
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</p>
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Pressure coefficient distribution at 5.5deg AoA on fine grid level
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<imgsrc="/vandv_files/30p30n/cf.png"alt="Skin friction coefficient distribution at 5.5deg AoA on fine grid level" />
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</p>
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Skin friction coefficient distribution at 5.5deg AoA on fine grid level
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