Calculating Cd from the pressure -- CFD Online Discussion Forums

December 18, 2015, 05:25

Calculating Cd from the pressure

Thuraya Kaadan

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Thuraya Kaadan

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Location: Nagoya, Japan

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I am doing a simulation using the Vortex in Cell method and the immersed boundary method using a FEM approach along with SOR , I have calculated the Velocity, Vorticity and drag forces successfully.
the photos are at time step =5 sec

The specifications of my simulation are:
Ly = 48.0 xgrid=384
Ly = 16.0 ygrid=128
Re=100 kinmatic viscosity 1/Re
inflow velocity U=1.0
Cylinder diameter D=1.0
The problem that I am facing is whenever I try to calculate the Lift and Drag forces they become 0 in less than 2 seconds of the flow.
I cannot understand why.
does anyone have a suggestion to solve this?

Attached Images

	velo005000.png (16.5 KB, 10 views)
	vorticity005000.png (6.1 KB, 8 views)
	pressure005000.png (16.4 KB, 7 views)

Tags

drag coefficient, lagrangian methods, vortex in cell, vortex method

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