The reference velocity is the velocity in the nozzle.įull set of non-dimensional governing equations used to predict the flow physics are continuity, momentum, energy and ideal gas. The references for pressure and temperature are the pressure and temperature in the reservoir. Non-dimensional analysis was applied to make the equations easy to converge. But when we cope with very complex physical interactions like shock waves, shear layer, turbulence, compressible flow and wave oscillations, it is proper to use full set of 3D, time-dependent governing equations, that requires numerical methods, boundary conditions and a lot of iterations to get some flow moving. The system of equations cannot be solved by analytical methods other than very simplistic cases. The PDE for 3D, transient flow are extremely complex due to non-linear, hyperbolic nature. Observe significant changes in density inside of the core

3D simulation of a supersonic jet, colors represent gas density. The numerical methods to solve 3D fluid equations for compressible flow are: Runge-Kutta, compact schemes, finite-differences, LES turbulence model, and LODI. The simulations here use air, Re 35000, Pr 0.7, different Mach numbers, pressure ration, temperature ratio and density ratio are 1 (equal to atmosphere conditions)s, circular jet exhausting to the atmosphere, no nozzle. This work is in progress waiting for approval to be released publicly Get stable combustion mixing in rocket engines o gas turbine burner and the laundry list goes on.ĬFD and Numerical simulations aid in the research of complex mechanisms in the supersonic jet and reduce but not supersede the experiments in the lab. Jets can be used to measure retro propulsion required to decelerate land rovers landing in other worlds. Jet noise emission can be reduced avoiding screech tones in order to meet regulations in cities. Such as avoiding turbulence in flight from re-ingesting exhaust gases from previous airplanes.

The understanding of the physical mechanisms in supersonic jets has multiple applications.

Supersonic jets are of great importance in industrial applications.

Tecplot 360 velocity profile tutorial