Bounds on Energy and Helicity Dissipation Rates of Approximate Deconvolution Models of Turbulence

نویسنده

  • William J. Layton
چکیده

We consider a family of high accuracy, approximate deconvolution models of turbulence. For body force driven turbulence, we prove directly from the models equations of motion the following bounds on the model’s time averaged energy dissipation rate, < "ADM >, and helicity dissipation rate, < ADM (w) >; < "ADM > 2 U3 L +Re 1 U3 L (1 + ( L )) , and j < ADM (w) > j U3 L2 + p 2Re 1 2 (1 + 2 L2 ) 1 2 U3 L2 +Re (1 + 2

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Energy and Helicity Dissipation Rates of the Ns-alpha and Ns-alpha-deconvolution Models

We consider the NS-alpha and the family of high accuracy, NS-alpha-deconvolution models of turbulence on Ω = [0, LΩ] 3 subject to periodic boundary conditions. For body force driven turbulence, we prove directly from the model equations of motion the following bounds on the time averaged modified energy dissipation rate, 〈εα,N(wα,N)〉, and unmodified helicity dissipation rate, 〈γ(wα,N)〉, for the...

متن کامل

The joint helicity-energy cascade for homogeneous, isotropic turbulence generated by approximate deconvolution models

In the large, getting a prediction of a turbulent flow right means getting the energy balance correct and getting the rotational structures correct. In two-dimensional flows this means (in the large) matching the energy and enstrophy statistics. In this report we consider a family of large eddy simulation approximate deconvolution models of turbulence. Based on a rigorous analysis of their kine...

متن کامل

Subgrid-scale modeling of helicity and energy dissipation in helical turbulence.

The subgrid-scale (SGS) modeling of helical, isotropic turbulence in large eddy simulation is investigated by quantifying rates of helicity and energy cascade. Assuming Kolmogorov spectra, the Smagorinsky model with its traditional coefficient is shown to underestimate the helicity dissipation rate by about 40%. Several two-term helical models are proposed with the model coefficients calculated...

متن کامل

Conservation Laws of Turbulence Models

Conservation of mass, momentum, energy, helicity, and enstrophy in fluid flow are important because these quantities organize a flow, and characterize change in the flow’s structure over time. Thus, if a simulation of a turbulent flow is to be qualitatively correct, these quantities should be conserved in the simulation. However, such simulations are typically based on turbulence models whose c...

متن کامل

Enhanced Physics-Based Numerical Schemes for Two Classes of Turbulence Models

We present enhanced physics-based finite element schemes for two families of turbulence models, the NS-ω models and the Stolz-Adams approximate deconvolution models. These schemes are delicate extensions of a method created for the Navier-Stokes equations in Rebholz 2007 , that achieve high physical fidelity by admitting balances of both energy and helicity that match the true physics. The sche...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • SIAM J. Math. Analysis

دوره 39  شماره 

صفحات  -

تاریخ انتشار 2007