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drag of cone

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Old   March 17, 2008, 09:37
Default drag of cone
  #1
Ebrahim
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Hi,

I'm trying to calculate the drag of a cone in fluent. My model is 2D, using symmetry.

I defined the wall of the cone as a seperate wall to calculate forces on the wall.

to calculate the dragforce you have to take the integral of sigma(ij)n(j)dS where sigma(ij)=-p.delta(ij) + tau(ij) where p is the static pressure en tau is the shear stress.

when the simulation is converged in Fluent I do : Report-forces-print. I get several values (static pressure, viscous pressure, total pressure, and matching coefficients)

my question: should I just sum the static force and viscous force and multiply it with the surface dS of the cone, or do I have to consider the normal on the surface?

thx!
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Old   March 17, 2008, 11:26
Default Re: drag of cone
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Ebrahim
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what do I have to take as area in Reference values? cause I'm working in 2D..

Does Fluent extrapolates the pressure from 2D to 3D to calculate the drag? in that case I can just take the area of a circle..
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Old   March 19, 2008, 06:21
Default Re: drag of cone
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Necmi
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İf you are modelling a cone, may be it would be a better choice to use an axis and and an axisymetric solver instead of symmetry.
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