Motivation, Development and Verification of a Rapid 3D Lagrangian Impingement Code – Trajectory and Catch 3D+ (TAC3D+) 2019-01-2011
This paper details the motivation, development and validation of a
rapid 3D Lagrangian impingement code, Trajectory and Catch 3D+
(TAC3D+). AeroTex’s motivation to develop a 3D Lagrangian
method was primarily driven by the inherent mesh dependent
dissipation effect found in their 3D Eulerian Water Catch code
(EWC) . Studies performed by AeroTex have shown that for
geometries where there are aft impingement regions that are partly
shadowed by a more forward impingement region, the level of water
flux dissipation can be significant, particularly if the mesh is coarse
and the impingement region is far aft. Examples of issues where this
may be a particular issue would be impingement on a centerline aft
mounted engine or the calculation of impingement on the wing
root/belly fairing. The code has been developed around a modified
version of the OpenFOAM Lagrangian solver. The analysis process
consists of three main phases; a coarse droplet trajectory calculation
to identify the region of interest, a refined trajectory calculation that
is sufficiently refined to calculate local water collection and a surface
water collection efficiency calculation including mass loss due to
splash and bounce associated with large droplets where applicable.
The code allows the user to utilize multiple cluster queues to spread
the job across multiple compute nodes to deliver the solution rapidly.
The TAC3D+ code has been verified against a selection of 2D and
3D cases including cases incorporating splash and bounce effects.
The code is undergoing further development to incorporate the
physics associated with ice crystals and the impingement of splashed
particles. In addition, AeroTex are exploring methods to make the
code more efficient by maximizing time steps, utilizing different
integration schemes and potential for the use of GPUs.
International Conference on Icing of Aircraft, Engines, and Structures