scholarly journals A third‐order compact nonlinear scheme for compressible flow simulations

2020 ◽  
Vol 92 (10) ◽  
pp. 1352-1367
Author(s):  
Zhuangzhuang Tian ◽  
Guangxue Wang ◽  
Fan Zhang ◽  
Huaibao Zhang
Keyword(s):  
Compressible Flow ◽  
Third Order ◽  
Flow Simulations

Numerical Studies on Trapped-Vortex Concepts for Stable Combustion

1998 ◽  
Vol 120 (1) ◽  
pp. 60-68 ◽  
Author(s):  
V. R. Katta ◽  
W. M. Roquemore
Keyword(s):  
Drag Coefficient ◽  
Reacting Flow ◽  
Flow Conditions ◽  
Third Order ◽  
Cold Flow ◽  
Flow Simulations ◽  
Numerical Studies ◽  
Dynamic Flows ◽  
Experimental Findings ◽  
Trapped Vortex

Spatially locked vortices in the cavities of a combustor aid in stabilizing the flames. On the other hand, these stationary vortices also restrict the entrainment of the main air into the cavity. For obtaining good performance characteristics in a trapped-vortex combustor, a sufficient amount of fuel and air must be injected directly into the cavity. This paper describes a numerical investigation performed to understand better the entrainment and residence-time characteristics of cavity flows for different cavity and spindle sizes. A third-order-accurate time-dependent Computational Fluid Dynamics with Chemistry (CFDC) code was used for simulating the dynamic flows associated with forebody-spindle-disk geometry. It was found from the nonreacting flow simulations that the drag coefficient decreases with cavity length and that an optimum size exists for achieving a minimum value. These observations support the earlier experimental findings of Little and Whipkey (1979). At the optimum disk location, the vortices inside the cavity and behind the disk are spatially locked. It was also found that for cavity sizes slightly larger than the optimum, even though the vortices are spatially locked, the drag coefficient increases significantly. Entrainment of the main flow was observed to be greater into the smaller-than-optimum cavities. The reacting-flow calculations indicate that the dynamic vortices developed inside the cavity with the injection of fuel and air do not shed, even though the cavity size was determined based on cold-flow conditions.

Immersed boundary technique for compressible flow simulations on semi-structured grids

2009 ◽  
pp. 365-370
Author(s):  
M.D. de Tullio ◽  
P. De Palma ◽  
G. Iaccarino ◽  
G. Pascazio ◽  
M. Napolitano
Keyword(s):  
Compressible Flow ◽  
Immersed Boundary ◽  
Structured Grids ◽  
Flow Simulations

Novel use of AMR Unstructured Grids in DSMC Compressible Flow Simulations

2017 ◽  
Author(s):  
Saurabh Sawant ◽  
Ozgur Tumuklu ◽  
Revathi Jambunathan ◽  
Deborah A. Levin
Keyword(s):  
Compressible Flow ◽  
Unstructured Grids ◽  
Flow Simulations

Compressible Flow Simulations on a Massively Parallel Computer

1991 ◽  
Vol 02 (01) ◽  
pp. 430-436
Author(s):  
ELAINE S. ORAN ◽  
JAY P. BORIS
Keyword(s):  
Compressible Flow ◽  
Chemical Reactions ◽  
Large Scale ◽  
Model Development ◽  
Time Dependent ◽  
Parallel Computer ◽  
Massively Parallel ◽  
Parallel Solution ◽  
Flow Simulations ◽  
Connection Machine

This paper describes model development and computations of multidimensional, highly compressible, time-dependent reacting on a Connection Machine (CM). We briefly discuss computational timings compared to a Cray YMP speed, optimal use of the hardware and software available, treatment of boundary conditions, and parallel solution of terms representing chemical reactions. In addition, we show the practical use of the system for large-scale reacting and nonreacting flows.

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