Assessment of continuum breakdown for high-speed chemically reacting wake flows

2016 ◽  
Author(s):  
Sharanya Subramaniam ◽  
Krishnan Swaminathan Gopalan ◽  
Kelly A. Stephani
Keyword(s):  
High Speed ◽  
Wake Flows ◽  
Continuum Breakdown ◽  
Chemically Reacting

Numerical Simulation of Heat Transfer and Fluid Dynamics in Supersonic Chemically Reacting Flows

2010 ◽  
Author(s):  
Alexander M. Molchanov ◽  
Anna A. Arsentyeva
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
High Speed ◽  
Stokes Equations ◽  
Order Approximation ◽  
Reacting Flows ◽  
Supersonic Combustion ◽  
Special Method ◽  
Chemically Reacting Flows ◽  
Chemically Reacting

An implicit fully coupled numerical method for modeling of chemically reacting flows is presented. Favre averaged Navier-Stokes equations of multi-component gas mixture with nonequilibrium chemical reactions using Arrhenius chemistry are applied. A special method of splitting convective fluxes is introduced. This method allows for using spatially second-order approximation in the main flow region and of first-order approximation in regions with discontinuities. To consider the effects of high-speed compressibility on turbulence the author suggests a correction for the model, which is linearly dependent on Mach turbulent number. For the validation of the code the described numerical procedures are applied to a series of flow and heat and mass transfer problems. These include supersonic combustion of hydrogen in a vitiated air, chemically reacting flow through fluid rocket nozzle, afterburning of fluid and solid rocket plumes, fluid dynamics and convective heat transfer in convergent-divergent nozzle. Comparison of the simulation with available experimental data showed a good agreement for the above problems.

Numerical simulation of high-speed turbulent reacting coaxial jet flow using a structured grid

2000 ◽  
Vol 214 (6) ◽  
pp. 359-368
Author(s):  
R C Mehta
Keyword(s):  
High Speed ◽  
Stokes Equations ◽  
Chemical Species ◽  
Steady State Solution ◽  
Single Step ◽  
Navier Stokes ◽  
Combustion Model ◽  
Structured Grid ◽  
Continuity Equations ◽  
Chemically Reacting

Reacting flowfields are described by compressible turbulent Reynolds-averaged Navier-Stokes equations augmented with appropriate species continuity equations that provide for the convection, diffusion and production of each chemical species. The closure of the system of equations is achieved using a two-equation turbulence model. A single-step overall fast chemical reaction combustion model based on the eddy break-up concept is employed for the turbulence-chemistry interaction. A finite volume discretization is carried out in spatial coordinates to compute inviscid and viscous flux vectors. A multistage Runge-Kutta time-stepping scheme is used to obtain a steady state solution. The numerical algorithm is developed by taking into consideration the structured grid arrangement for a turbulent chemically reacting coaxial jet. The numerical scheme is shown to be computationally fact, easy to program and efficient. A supersonic diffusion flame is analysed and the results are compared with the available experimental data.

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