Cobalt V8.0 Now Available

Posted on January 8, 2019January 8, 2019 by cobalt_admin

Cobalt V8.0 Released

Cobalt Solutions, LLC is pleased to announce the release of Cobalt V8.0. Several of the enhancements are listed below:

Addition of the Quadratic Constitutive Relation (QCR) for Spalart-Allmaras turbulence models.
Addition of the 2-D User Data boundary condition. This allows the user to specify variation of variables on a plane which is used to determine the boundary condition.
Modification to the for the User-Coded boundary condition to pass additional variables.
Modification to the Grid Deformer interface to load a grid deformer as a run-time library.
General improvements in the overall algorithm.

For more information and download instructions, please contact support.

Posted in News.

cobalt_admin

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