Brian Robinson

Aerodynamic Centre of an aircraft

Discussion created by Brian Robinson on May 8, 2009
Latest reply on Jun 24, 2020 by Jacky Hao
Hi, I was wondering if there is an efficient way to determine the aerodynamic centre of an aircraft. I set up a model of the aircraft where drag is in the Z direction and lift is in the Y direction. I set up a grid of coordinate systems and applied Global Goal Torque about X at each of these coordinate systems. I was hoping to find various values at each location and then run again at another angle and find a pair of values that remain constant to determine the aerodynamic centre. The initial flow simulation however showed all values as being the same, as if they were about the origin instead.

Is there not a way to specify torque about a point? What is the purpose of being able to select another coordinate system in defining the torque about X? Is my only option to set the highest level assembly origin at only one aerodynamic centre point and run many iterations until I find the correct point?

Note that for some reason Flow Simulation crashes when trying to select a coordinate system at the same time as defining a global goal for torque. I had to define the global goals first, then edit each one after to select the coordinate system. Is this a bug?

Peter Ferreira