BRC: Malleatus, part 3

Posted on November 24, 2017November 24, 2017 by Bob Tomaro

The third milestone in making Malleatus production ready was to allow user control of the deformation of the boundary surfaces. I developed an interface such that the user can code how the boundaries move and pass/receive information to Malleatus. The exchange of information is shown below:

For this post, I revisited the F-16. I will show animations of twisting and bending of the the wing using the user-coded boundary movement library. Additionally, this case was run using small scale parallelization (up to 8 processors).

For the bending case, the wing undergoes bending from 10% of the span to the tip. The deflection is a quadratic shape. The maximum tip deflection is roughly 60 inches. The simulation shows two cycles of motion.

For the twisting simulation, the tip rotates +/-55 degrees. Two complete cycles are shown.

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Bob Tomaro

The equilibrium air module uses the curve fits of Tannehill, et al. to calculate the thermodynamic and molecular properties of air when intermolecular forces become important. As temperature becomes large, dissociation and eventually ionization occurs. The thermodynamic properties of air become dependent on two variables (T = T(P,e)). For hypersonic flows, this has the effect of weakening the strength of a shock wave. The table below shows the temperatures at which dissociation and ionization become important. Molecular vibrations start occurring around T=600 K which is the temperature value where starts γ changing.

Temperature Range	Chemical Composition
T < 2500 K	78% N₂, 21% O₂
2500 K < T < 4000 K	Oxygen dissociation regime. Some NO is formed
4000 K < T < 8000 K	Nitrogen dissociation regime. Oxygen is fully dissociated.
8000 K < T	Ionization of atomic constituents occurs