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!

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..

Ä°f 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.