The AGE method for direct numerical simulation of turbulent shear flow

Bisset, D. K.

doi:10.1002/(sici)1097-0363(19981115)28:7<1013::aid-fld747>3.0.co;2-i

Cited by 3 publications

(5 citation statements)

References 27 publications

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“…Given the philosophy behind the development of the AGE method [1] that somewhat favours e ciency in the trade-o s between e ciency and accuracy, the results to follow show a very satisfactory level of agreement. Further, this agreement is in contrast to the quite di erent results that were obtained from another AGE simulation with di erent initial conditions, discussed brie y at the end of the next section.…”

Section: Introductionmentioning

confidence: 90%

“…The pressure smoothing parameter W P (see Reference [1]) can be dealt with very quickly: over the range of at least 0:26W P 60:9, the value of W P has very little e ect on both DNS and auto-LES results, including pressure variances and power spectra as well as velocity results. At W P = 0:99 (almost no smoothing) on the R8 grid, however, a large amount of numerical noise had built up by the end of the run, and the simulation was starting to break down.…”

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

“…The setting of the targeted di usion parameter W V [1] was expected to have a greater in uence on results. For example, auto-LES of a fairly high Reynolds number spatially developing mixing layer showed some e ect from the W V value even though the resolution was approaching DNS [2].…”

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

“…Transverse variances are presented in Figure 7, where a very slight increase is seen for W V = 2:5; there is no significant di erence in V power spectra (Figure 8). Targeted di usion was originally derived with W V = 1:0 [1], but higher values were needed in practice. Present experience seems to support wave number spectral density the original concept for DNS.…”

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

“…The idea behind targeted di usion is that the current value of a velocity component in a time advancement equation should always be multiplied by a coe cient in the range 0.0-1.0, with the upper limit being the important case for turbulent ow [1]. When the coe cient would go above 1.0 the particular velocity component is modiÿed in a manner that amounts to a temporary local increase in di usion, at a level controlled by W V .…”

Section: A Grid Reynolds Number For Targeted DI Usionmentioning

confidence: 99%

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AGE method simulations of a turbulent far‐wake compared to spectral DNS

Bisset

2002

Numerical Methods in Fluids

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SUMMARYTurbulent ow simulation methods based on ÿnite di erences are attractive for their simplicity, exibility and e ciency, but not always for accuracy or stability. This paper demonstrates that a good compromise is possible with the advected grid explicit (AGE) method. Starting from the same initial ÿeld as a previous spectral DNS, AGE method simulations of a planar turbulent wake were carried out as DNS, and then at three levels of reduced resolution. The latter cases were in a sense largeeddy simulations (LES), although no speciÿc sub-grid-scale model was used. Results for the two DNS methods, including variances and power spectra, were very similar, but the AGE simulation required much less computational e ort. Small-scale information was lost in the reduced resolution runs, but large-scale mean and instantaneous properties were reproduced quite well, with further large reductions in computational e ort. Quality of results becomes more sensitive to the value chosen for one of the AGE method parameters as resolution is reduced, from which it is inferred that the numerical stability procedure controlled by the parameter is acting in part as a sub-grid-scale model.

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Section: Introductionmentioning

confidence: 90%

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

Section: Parameter Values For Dns and Auto-lesmentioning

confidence: 99%

Section: A Grid Reynolds Number For Targeted DI Usionmentioning

confidence: 99%

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