The software allows to calculate a full set of aerodynamic coefficients and their dynamic derivatives for an arbitrary body in the free molecular flow. Using this software, one can obtain all the components of the aerodynamic force and torque as functions of the attitude and angular velocity. The dependence of aerodynamic coefficients on angular velocity is especially important for satellites in Very Low Earth Orbits (VLEO), typically characterized by altitudes of 100–450 km.
The surface of the body is divided into a number of small elements, then the pressure and shear stress coefficients are calculated for each element using the Schaaf and Chambre’s approach, and, finally, integration over the surface gives the aerodynamic coefficients. Obviously, the elements that are shielded by the upstream components of the body are excluded from consideration.
The software is written in Wolfram Language, with all its core functions compiled into C code. A few examples of using the software are shown below.
An example of calculating the aerodynamic damping pitch torque coefficient for a Vostok-like reentry vehicle (sphere with its CoM shifted from the geometric center). The pitch damping torque for this type of vehicle can be easily found analytically, so it is a good opportunity to validate the correctness of the numerical calculation. All seems to work just fine!
An example of calculating the aerodynamic coefficients for a 3U CubeSat with big solar panel (like the ESTCube-2 satellite)
An aerodynamically stabilized CubeSat with pyramidal nose (from the recent Acta Astronautica paper). Such satellite can be used in VLEO. The aerodynamic restoring and damping torques coefficients as functions of the angle of attack are shown below.
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