dorsal/arxiv
View SchemaMixing in manipulated turbulence
| Authors | Arkadiusz K. Kuczaj, Bernard J. Geurts |
|---|---|
| Categories | |
| ArXiv ID | physics/0601164 |
| URL | https://arxiv.org/abs/physics/0601164 |
| DOI | 10.1080/14685240600827534 |
Abstract
A new computational framework for the simulation of turbulent flow through complex objects and along irregular boundaries is presented. This is motivated by the application of metal foams in compact heat-transfer devices, or as catalyst substrates in process-engineering. The flow-consequences of such complicated objects are incorporated by adding explicit multiscale forcing to the Navier-Stokes equations. The forcing represents the simultaneous agitation of a wide spectrum of length-scales when flow passes through the complex object. It is found that a considerable modulation of the traditional energy cascading can be introduced with a specific forcing strategy. In spectral space, forcing yields strongly localized deviations from the common Kolmogorov scaling law, directly associated with the explicitly forced scales. In addition, the accumulated effect of forcing induces a significant non-local alteration of the kinetic energy including the spectrum for the large scales. Consequently, a manipulation of turbulent flow can be achieved over an extended range, well beyond the directly forced scales. The turbulent mixing of a passive scalar field is also investigated, in order to quantify the physical-space modifications of transport processes in multiscale forced turbulence. The surface-area and wrinkling of level-sets of the scalar field are monitored as measures of the influence of explicit forcing on the local and global mixing efficiency.
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"abstract": "A new computational framework for the simulation of turbulent flow through\ncomplex objects and along irregular boundaries is presented. This is motivated\nby the application of metal foams in compact heat-transfer devices, or as\ncatalyst substrates in process-engineering. The flow-consequences of such\ncomplicated objects are incorporated by adding explicit multiscale forcing to\nthe Navier-Stokes equations. The forcing represents the simultaneous agitation\nof a wide spectrum of length-scales when flow passes through the complex\nobject. It is found that a considerable modulation of the traditional energy\ncascading can be introduced with a specific forcing strategy. In spectral\nspace, forcing yields strongly localized deviations from the common Kolmogorov\nscaling law, directly associated with the explicitly forced scales. In\naddition, the accumulated effect of forcing induces a significant non-local\nalteration of the kinetic energy including the spectrum for the large scales.\nConsequently, a manipulation of turbulent flow can be achieved over an extended\nrange, well beyond the directly forced scales. The turbulent mixing of a\npassive scalar field is also investigated, in order to quantify the\nphysical-space modifications of transport processes in multiscale forced\nturbulence. The surface-area and wrinkling of level-sets of the scalar field\nare monitored as measures of the influence of explicit forcing on the local and\nglobal mixing efficiency.",
"arxiv_id": "physics/0601164",
"authors": [
"Arkadiusz K. Kuczaj",
"Bernard J. Geurts"
],
"categories": [
"physics.flu-dyn",
"physics.comp-ph"
],
"doi": "10.1080/14685240600827534",
"title": "Mixing in manipulated turbulence",
"url": "https://arxiv.org/abs/physics/0601164"
},
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