Loads and coefficientsΒΆ
PyTornado computes different global force and moment coefficients. The definitions are described below. Notice that there are three different reference values:
- \(S\) : Reference area
- \(c\) : Reference chord
- \(b\) : Reference span
There are two sets of force coefficients, the fist being described in the body-fixed system and the second being described in the aerodynamic system (see also Coordinate systems). The global force coefficients \(C_X\), \(C_Y\), \(C_Z\) in the body-fixed system are defined as
where \(F_x\), \(F_y\) and \(F_z\) are global forces in \(X\), \(Y\) and \(Z\) directions, respectively, \(q\) is the dynamic pressure. Global lift, drag and side force coefficients (\(C_L\), \(C_D\), \(C_C\)) describe forces in the aerodynamic coordinate system and are defined as
where \(F_L\), \(F_D\) and \(F_C\) are global lift, drag and side force (in Newtons) in the aerodynamic system. Moment coefficients are defined with respect to the body-fixed system as
where \(M_x\), \(M_y\) and \(M_z\) are global moments about the in \(X\), \(Y\) and \(Z\) directions, respectively.
TODO explain gcenter
and rcenter