Cd Value of a cylinder

mranji1 · April 30, 2009, 01:22

Hi,
I have simulated flow over a stationary cylinder using the immersed boundary method.I used feedback forcing schme with 4-point delta function.The no-slip boundary conditions are satisfying and the l2-norm error is of the order of 10e-4.but iam getting a high value of Cd.when i used a domain of 14dx7d with d=1 for Re=10 i got Cd=4.37.when i doubled the domain i got Cd=3.29.time step i used is 10e-3.Can anyone tell me what will be the problem.i computed Cd using the method prescribed by Peskin...adding all the momentum forcing values for the drag force and then using the wellknown cd formula.....
Plse give a reply......
Thankig you all.......

xdanielx · April 30, 2009, 01:55

have a look at

http://www.cfd-online.com/Forums/ope...-cylinder.html

hope this helps and good luck!

April 30, 2009, 01:22	Cd Value of a cylinder	#1
mranji1 New Member Ranjith Join Date: Apr 2009 Posts: 4 Rep Power: 16	Hi, I have simulated flow over a stationary cylinder using the immersed boundary method.I used feedback forcing schme with 4-point delta function.The no-slip boundary conditions are satisfying and the l2-norm error is of the order of 10e-4.but iam getting a high value of Cd.when i used a domain of 14dx7d with d=1 for Re=10 i got Cd=4.37.when i doubled the domain i got Cd=3.29.time step i used is 10e-3.Can anyone tell me what will be the problem.i computed Cd using the method prescribed by Peskin...adding all the momentum forcing values for the drag force and then using the wellknown cd formula..... Plse give a reply...... Thankig you all.......

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April 30, 2009, 01:55		#2
xdanielx New Member Daniel Langmayr Join Date: Mar 2009 Posts: 15 Rep Power: 17	have a look at http://www.cfd-online.com/Forums/ope...-cylinder.html hope this helps and good luck!