, Volume 54, Issue 1, pp 145–168 | Cite as

Existence theory of abstract approximate deconvolution models of turbulence



This report studies an abstract approach to modeling the motion of large eddies in a turbulent flow. If the Navier-Stokes equations (NSE) are averaged with a local, spatial convolution type filter, \(\overline{\bf \phi} = g_{\delta}\,*\,{\bf \phi}\) , the resulting system is not closed due to the filtered nonlinear term \(\overline{\bf uu}\) . An approximate deconvolution operator D is a bounded linear operator which is an approximate filter inverse
$$D(\overline{\bf u}) = {\rm approximation\,of}\, {\bf u}.$$
Using this general deconvolution operator yields the closure approximation to the filtered nonlinear term in the NSE
$$\overline{\bf uu} \simeq \overline{D(\overline{\bf u})D(\overline{\bf u})}.$$
Averaging the Navier-Stokes equations using the above closure, possible including a time relaxation term to damp unresolved scales, yields the approximate deconvolution model (ADM)
$${\bf w}_{t} + \nabla \cdot \overline{D({\bf w})\,D({\bf w})} - \nu \triangle{\bf w}+\nabla q + \chi {\bf w}^* = \overline{\bf f} \quad {\rm and} \quad \nabla \cdot {\bf w} = 0.$$
Here \({\bf w} \simeq \overline{\bf u}\) , χ ≥ 0, and w* is a generalized fluctuation, defined by a positive semi-definite operator. We derive conditions on the general deconvolution operator D that guarantee the existence and uniqueness of strong solutions of the model. We also derive the model’s energy balance.


Large eddy simulation Turbulence Deconvolution 

Mathematics Subject Classification (2000)

76F65 76D03 


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© Università degli Studi di Ferrara 2008

Authors and Affiliations

  1. 1.Department of MathematicsUniversity of PittsburghPittsburghUSA

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