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Propeller simulation not matching experimental data

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Old   April 12, 2024, 14:25
Default Propeller simulation not matching experimental data
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Kevin Gnanaraj
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Hi,
I'm trying to do a simple propeller simulation based on this paper: 3D CFD Simulation and Experimental Validation of Small APC Slow Flyer Propeller Blade (Kutty and Rajendran, 2017), using a different 22 in propeller from T-motor. I've set up a simulation using both Frozen Rotor and Mixing Planes in CFX, and tried a few different Boundary Conditions: inlet: velocity, mass flow and total pressure, outlet: avg. static pressure, static pressure, opening), conducted a mesh independence study, and none of these seem to match the experimental thrust. (Mixing planes always ends up with floating point overflow, even with double precision). Right now, I'm trying a physical timescale of 1/propeller rotational velocity (rad s-1). I have been using the k-omega SST model.

What I am trying to do is a static thrust study of the propeller. Can someone point me to to a paper or resources on how to set this up correctly, or explain the appropriate boundary conditions? I've been stuck on this issue for a month, and I'll need to move to a co-axial co-rotating study once this is done, so I want to get this right and understand why before moving on. An issue I'm seeing is that the velocity leaks radially instead of through the propeller. Hopefully I've attached the images correctly.
438065022_960348448716476_6737782057466766531_n.jpg

438065217_1645858406189039_5850337538447370833_n.png

438083337_1359463431392043_2573848191980117877_n.png

438051586_884524410101071_5336072679999309056_n.png
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floating point exception, mixing planes, propeller flow error


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