Hi all,

I am calculating the total moment of a Vertical Axis Wind Turbine in 2D as shown below (experimenting with only one blade).

I set up the CFD with sliding mesh (grey area) in trasient simulation

I have a question: **When I calculate moment coefficient, does ANSYS Fluent already take into account the relative velocity between the blade (rotational velocity) and the wind (inlet velocity)? **

To make it clearer, let's denote: V(a/g): Velocity of air with respect to (wrt) the ground a.k.a inlet velocity, V(t/g): Velocity of turbine wrt the ground a.k.a tangential velocity and V(a/t): Velocity of air wrt turbine

**V(a/g) = V(t/g) + V(a/t)** - In vector notation

In other words, does **ANSYS Fluent automatically calculate Cm, Cl and Cd based on the relative velocity** (Va/t)?

I can extract Cm versus flow time but I'm not sure how ANSYS Fluent calculate Cm (as well as Cd and Cl) when there is a sliding mesh involved.

Thank you very much.