[aja1345]

Hi,



Please consider an area inclined at an angle θ to the flow direction, How can I calculate drag force for this condition in FLUENT?





I want to calculate drag force at special angle on a sphere . There are some grooves on the sphere and these groove have a special angle on the sphere. In other words, I want to calculate drag force on the these grooves. How can I do it in Fluent?





Thanks.

[`e`]

You could use the drag monitor and specify the force vector with your angle, where the default is (1,0,0) which corresponds to the x-direction.

[aja1345]

Originally Posted by `e`

You could use the drag monitor and specify the force vector with your angle, where the default is (1,0,0) which corresponds to the x-direction.

Thanks

but how can I provide x,y,z coordinates in Fluent? Please see y-z coordinate in second picture and the following picture. Therefore, direction vector is as follows (Direction of flow is in direction (or parallel) of grooves):






y----> -cos theta



z----> -sin theta


x---->0



theta=angle



Is it OK?

[aja1345]

If drag is a force acting opposite to the motion of Fluid, therfore, I should change direction vector as follows:



y----->+cos theta

z----->+sin theta



.....Is it correct?

[aja1345]

In fact, Firstly, i select my surface, then, I change the direction vector .