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Wiggles in Cp plots over Store Fins

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Old   June 29, 2015, 03:41
Default Wiggles in Cp plots over Store Fins
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Bharatesh
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Hi all,
This is a strange experience I am having here.Here is what its all about:

1. Made Viscous mesh for Generic Wing Pylon with Finned Store model using Pointwise V17. Examined at various cuts, and the mesh seemed to be okay. Totally made 3 blocks, blk1-A Rectangular block with dense volume cells around Finned Store, blk2-A hemisphere with coarse volume cells around the entire wing-pylon-FinnedStore geometry, blk3-One more bigger hemisphere around the entire blk2 with more coarsen grid (shared pics).

2. Solved the grid using SU2 with approximately 20,000 iterations, and the Cl and Cd values seemed to be converging.

3. Post Processed the solution files using Tecplot 360. Took various slices on the Fins, and for every slice, plotted Cp V/s X/C plots.

Surprisingly, I see wiggles on the Cp curves. I dont understand why!!.

Can somebody help me understand why I am getting Wiggles!! I'm struggling for the past 2 weeks with this problem.
Attached Images
File Type: jpg All.jpg (66.1 KB, 2 views)
File Type: jpg blk2.jpg (94.3 KB, 2 views)
File Type: jpg FinnedStore(highlighted).jpg (99.0 KB, 3 views)
File Type: jpg storeFrontView.jpg (97.9 KB, 2 views)
File Type: jpg Fin1.jpg (100.5 KB, 3 views)
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Old   June 29, 2015, 03:55
Default Attaching pics of Cp plots
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Bharatesh
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Posting reply as the max pic upload in the original thread is 5, uploading Cp plot pic.

Black Delta -->Experimental Data
Pink curve -->Cp curve on Fin 1
At Slice 1 near the store body
Attached Images
File Type: jpg vf1-s1.jpg (35.4 KB, 6 views)
File Type: png fin1-slice1.png (20.5 KB, 3 views)
File Type: jpg wingpylonstore.jpg (19.9 KB, 3 views)
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