Higher-Order Compact Difference Scheme Applied to Low Sweep Delta Wing Flow

2003 ◽  
Author(s):  
Raymond Gordnier ◽  
Miguel Visbal
Keyword(s):  
Difference Scheme ◽  
Delta Wing ◽  
Higher Order ◽  
Compact Difference Scheme ◽  
Compact Difference

Compact Difference Scheme Applied to Simulation of Low-Sweep Delta Wing Flow.

AIAA Journal ◽  
2005 ◽  
Vol 43 (8) ◽  
pp. 1744-1752 ◽  
Author(s):  
Raymond E. Gordnier ◽  
Miguel R. Visbal
Keyword(s):  
Difference Scheme ◽  
Delta Wing ◽  
Compact Difference Scheme ◽  
Compact Difference

High-Order Computational Techniques for Unsteady Vortical Flows Over Delta Wings

2006 ◽  
Author(s):  
Raymond E. Gordnier ◽  
Miguel R. Visbal
Keyword(s):  
Difference Scheme ◽  
Delta Wing ◽  
High Order ◽  
Vortical Flow ◽  
Compact Difference Scheme ◽  
Delta Wings ◽  
Vortical Flows ◽  
Compact Difference ◽  
Moderate Reynolds Number ◽  
The Impact

A high-order computational method for the highly unsteady, complex vortical flows over delta wings is presented. A sixth-order compact difference scheme with an eighth-order low pass filter is used to solve the Navier-Stokes equations. Two approaches to turbulence modeling are investigated. The first scheme is an implicit LES (ILES) method which exploits the high-order accuracy of the compact difference scheme and uses the discriminating higher-order filter to regularize the flow. The second approach is a new hybrid RANS/ILES method which employs a standard k–ε model in regions where the grid resolution is unable to capture the turbulent behavior, and transitions to the ILES method in the vortical flow region where large scale turbulent structures are resolved. Computational simulations have been performed for a 50° sweep delta wing at 15° angle of attack and a moderate Reynolds number, Re = 2 × 106. Solutions employing the two turbulence models are evaluated on a baseline grid. A fine mesh computation has been performed for the ILES approach to investigate the impact of mesh resolution on this scheme. Computed results are also compared with the limited experimental measurements available. Computations exploring the control of the vortical flows above a swept delta wing by use of a dialectric-barrier-discharge actuator are also presented. With the actuator located near the apex, significant movement of the vortex breakdown location and a dramatic transformation of the shear-layer sub-structures are demonstrated.

Direct calculation of waves in fluid flows using high-order compact difference scheme

AIAA Journal ◽  
1994 ◽  
Vol 32 (9) ◽  
pp. 1766-1773 ◽  
Author(s):  
Sheng-Tao Yu ◽  
Lennart S. Hultgren ◽  
Nan-Suey Liu
Keyword(s):  
Difference Scheme ◽  
Fluid Flows ◽  
Direct Calculation ◽  
High Order ◽  
Compact Difference Scheme ◽  
Compact Difference
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