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Very High Coefficient of Pressure Values for Flow Pas a Circular 2D Cylinder

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Old   May 28, 2021, 05:57
Default Very High Coefficient of Pressure Values for Flow Pas a Circular 2D Cylinder
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Hello CFD Community,

I'm relatively new to Fluent, and I'm performing a 2D analysis of a flow past a circular cylinder as a part of my project. The cylinder is 6 mm in diameter and the inlet velocity of 20 m/s, making the Reynold's number 7638. The drag coefficient value is around 1.97, which agrees with literature, while the coefficient of pressure value is ridiculously high. I've used a tri mesh, with 50 layers of inflation at a growth rate of 1.2. The first element size was calculated to be around 1e-5 for a y+ of 0.8, to capture boundary layer effects.
The Cp vs length plot shows values of 500, which is much too high. I also plotted cp vs theta upto 180 (since fluent plots against length), and have attached it herewith. The nature of the graph appears okay I think, but can anyone please help me with why the cp values are so high?

Thanks so much in advance
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File Type: png image_2021-05-28_152147.png (140.7 KB, 2 views)
File Type: png image_2021-05-28_152235.png (19.9 KB, 2 views)
File Type: png image_2021-05-28_152437.png (15.3 KB, 2 views)
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ansys 2020, cylinder flow, external aerdynamics, flow past cylinder, fluent

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