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10/25/2009
On October 25, 2009, Advanced Dynamics Corporation released the Word's first multi-disciplinary, multi-physics, multi-scale and multi-fidelity analysis amd design optimization (4MAO) ...... |
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PROPULSION:
The propulsion module is used to study the complex phenomena encountered in propulsion devices including turbulence, combustion, shock using high-order numerics and accurate boundary conditions to minimize dissipation and dispersion errors. The CFD solver used in this module is based on structured grid. Complex geometries can be simulated using multiple-blocks structured grid to mimic realistic propulsion devices. Unlike most commercial software, the propulsion module in ASTE-P implements high-order numerics to maintain accuracy, state-of-the-art models are incorporated and is computationally efficient. The main features include:
LES Simulation of a Combustor |
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| Instantaneous Contours of Vorticity Magnitude for a Confined Nonswirling Jet Using LES |
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| LES Results for a Confined Nonswirling Jet (Solid lines) Compared with Experimental Data(Circular Symbols) |
(a) Temperature |
(b) Reaction rate |
| Instantaneous Snapshots Showing Contours of (a) Temperature, (b) Reaction rate for Reacting Flow |
¡ñ Favre-filtered fully compressible Navier-Stokes, total energy and species equations are solved in curvilinear coordinate system
¡ñ Sixth-order compact schemes and fifth-order WENO schemes for spatial discretization and fourth-order Runge-Kutta method for temporal integration are employed
¡ñ Characteristic-based, non-reflecting boundary conditions are specified to minimize reflections from inflow and outflow boundaries
¡ñ A high-order implicit filter is used to remove saw-tooth-like numerical oscillations.
¡ñ To avoid any oscillations entering the computational domain from the outflow, an exit-zone approach was implemented
¡ñ Both 2D and 3D simulations can be run using this module
¡ñ Dynamic Smagorinsky Model (DSM) was used for SGS modeling in Large Eddy Simulations (LES)
¡ñ Turbulence models including RANS (using k-¦Ø and Spalart-Almaras models) and Detached Eddy Simulation (DES) are also available
¡ñ The three modes of combustion viz. premixed, non-premixed and partially-premixed combustion can be modeled using state-of-the-art combustion models
¡ñ The code is implemented to run in parallel using Message-Passing-Interface (MPI) as the inter-process communication library, and full three-dimensional domain decomposition is used to allow for scaling to large problems
¡ñ Multiblock approach using overlapping grids is used for complex geometries. The multiblock approach also improves the efficiency of the solver.
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Predictions of Mean of Temperature for Reacting Flow using LES (Solid Lines) Compared with Experimental Measurements (Symbols) |
(a) Vorticity magnitude |
(b) Density |
| Instantaneous Snapshot of (a) Vorticity Magnitude and (b) Density Contours for Supersonic Jet Impinging on a Wall. Waves Propagating between the Impinging Wall and the Upper Lift Wall Can Be Seen in the Density Contours. |
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