Computational Fluid Dynamics Compatible Transition Modeling Using an Amplification Factor Transport Equation

Coder, James G.; Maughmer, Mark D.

doi:10.2514/1.j052905

Cited by 172 publications

(33 citation statements)

References 16 publications

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“…The additional turbulence model variants used are SA-noft2 and SA-noft2-RC. The transition model used was the AFT model of Coder and Maughmer [22] and Coder [23]. Specifically, a new variant, termed AFT2017b, was employed in conjunction with the SA-RC-QCR2000 turbulence model (SA-RC-QCR2000-AFT2017b).…”

Section: B Jaxa Standard Model (Jsm)mentioning

confidence: 99%

“…The AFT2017b laminar-turbulent transition model is an extension and enhancement of the amplification factor transport (AFT) transition model of Coder and Maughmer [22] and Coder [23]. As the full model definition has not yet appeared in a print publication, it is provided here for the benefit of the readers.…”

Section: Appendix -Aft2017b Transition Model Definitionmentioning

confidence: 99%

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Contributions to HiLiftPW-3 Using Structured, Overset Grid Methods

Coder

Pulliam

Jensen

2018

2018 AIAA Aerospace Sciences Meeting

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The High-Lift Common Research Model (HL-CRM) and the JAXA Standard Model (JSM) were analyzed computationally using both the OVERFLOW and LAVA codes for the third AIAA High-Lift Prediction Workshop. Geometry descriptions and the test cases simulated are described. With the HL-CRM, the effects of surface smoothness during grid projection and the effect of partially sealing a flap gap were studied. Grid refinement studies were performed at two angles of attack using both codes. For the JSM, simulations were performed with and without the nacelle/pylon. Without the nacelle/pylon, evidence of multiple solutions was observed when a quadratic constitutive relation is used in the turbulence modeling; however, using time-accurate simulation seemed to alleviate this issue. With the nacelle/pylon, no evidence of multiple solutions was observed. Laminar-turbulent transition modeling was applied to both JSM configuration, and had an overall favorable impact on the lift predictions. Nomenclature AR = wing aspect ratio= total number of grid points Re = Reynolds number based on reference chord length S = reference wing area x = x-coordinate direction y = y-coordinate direction α = angle of attack η = non-dimensional spanwise coordinate, 2y/b Subscripts ∞ = free-stream conditions

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Section: B Jaxa Standard Model (Jsm)mentioning

confidence: 99%

Section: Appendix -Aft2017b Transition Model Definitionmentioning

confidence: 99%

Contributions to HiLiftPW-3 Using Structured, Overset Grid Methods

Coder

Pulliam

Jensen

2018

2018 AIAA Aerospace Sciences Meeting

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“…The last considered model, SA e N of Coder [7], contains a differential equation for the growth factor N with source terms based on the Drela [8] realization of e 9 method [9] which was initially developed for natural transition prediction. For extension of this method to higher Tu levels, Mack [10] correction was used.…”

Section: Considered Modelsmentioning

confidence: 99%

Comparative analysis of transition models at different farfield turbulence intensities

Stabnikov

Garbaruk

2017

J. Phys.: Conf. Ser.

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Abstract. Four differential models for laminar-turbulent transition prediction were tested with different freestream turbulence levels on two cases: turbulent boundary layer and flow around NACA0021 airfoil. Computational results show that none of the considered models are able to predict transition in a wide range of freestream conditions. SA e N model is applicable only for natural transition scenario with low freestream turbulence intensity and predicts fully turbulent solutions in other cases. Among γ-based models SST γ-Re θ and SST γ have shown better agreement with experiment than SA γ.

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“…For some time this modeling approach was and still is modified and adapted for super-sonic and hypersonic flows [78][79] and surface roughness [80][81][82][83], it was coupled to the Spalart-Allmaras (SA) turbulence model [84][85] in [82,[86][87][88] and reduced to a single γ-equation [87,89]. In [90,91] an amplification factor transport (AFT) equation is used transporting streamwise N-factors of an approximate e N method that provides the envelope Nfactors. Currently, the γ-Re θ model [76] is coupled to differential RSM [3][4][5][6] in the authors' group.…”

Section: Transport Equation Approachesmentioning

confidence: 99%

“…o The fundamental concept would be similar to the amplification factor transport (AFT) method from [90,91] where streamwise N-factors of an approximate e N method providing the envelope N-factors are transported.…”

Section: Future Challenges For Cfd Transition Predictionmentioning

confidence: 99%