Journal ArticleDOI
Global in Time Analysis and Sensitivity Analysis for the Reduced NS-α Model of Incompressible Flow
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In this article, a detailed global in time analysis, and sensitivity analysis and testing, for the recently proposed reduced NS-α model is provided, and an efficient numerical scheme for the sensitivity system is proposed and analyzed, and proven to be stable and optimally accurate.Abstract:
We provide a detailed global in time analysis, and sensitivity analysis and testing, for the recently proposed (by the authors) reduced NS-α model. We extend the known analysis of the model to the global in time case by proving it is globally well-posed, and also prove some new results for its long time treatment of energy. We also derive PDE system that describes the sensitivity of the model with respect to the filtering radius parameter, and prove it is well-posed. An efficient numerical scheme for the sensitivity system is then proposed and analyzed, and proven to be stable and optimally accurate. Finally, two physically meaningful test problems are simulated: channel flow past a cylinder (including lift and drag calculations) and turbulent channel flow with $${Re_{\tau}=590}$$
. The numerical results reveal that sensitivity is created near boundaries, and thus this is where the choice of the filtering radius is most critical.read more
Citations
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Journal ArticleDOI
A modular regularized variational multiscale proper orthogonal decomposition for incompressible flows
TL;DR: The projection-based VMS stabilization is added as a separate post-processing step to the standard POD approximation, and since the stabilization step is completely decoupled, the method can easily be incorporated into existing codes, and stabilization parameters can be tuned independent from the time evolution step.
Journal ArticleDOI
A sensitivity study of the Navier–Stokes-α model
TL;DR: A sensitivity study of the Navier Stokes- α model with respect to perturbations of the differential filter length α, and a practical technique to utilize sensitivity calculations to determine the reliability of the NS α model in problem-specific settings is demonstrated.
Posted Content
Sensitivity Analysis for the 2D Navier-Stokes Equations with Applications to Continuous Data Assimilation
Adam Larios,Elizabeth Carlson +1 more
TL;DR: This appears to be the first such rigorous proof of global existence and uniqueness to strong or weak solutions to the sensitivity equations for the 2D Navier-Stokes equations (in the natural case of zero initial data), and that they can be obtained as a limit of difference quotients with respect to the Reynolds number.
Approximate deconvolution models of turbulence: analysis, phenomenology and numerical analysis / William J. Layton, Leo G. Rebholz
TL;DR: The Leray-Deconvolution Regularization and NS-alpha-and NS-omega-DECONVolution Regularizations as mentioned in this paper are two popular regularization regularizations.
Journal ArticleDOI
The Reduced NS-α Model for Incompressible Flow: A Review of Recent Progress
Abigail L. Bowers,Leo G. Rebholz +1 more
TL;DR: In this paper, a review of recent results for the reduced Navier-Stokes-α (rNS-α) model of incompressible flow is presented, and some open problems for future work are discussed.
References
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Journal ArticleDOI
Direct numerical simulation of turbulent channel flow up to Reτ=590
TL;DR: In this paper, numerical simulations of fully developed turbulent channel flow at three Reynolds numbers up to Reτ=590 were reported, and it was noted that the higher Reynolds number simulations exhibit fewer low Reynolds number effects than previous simulations at Reτ = 180.
Journal ArticleDOI
Direct numerical simulation of turbulent channel flow up to
Myoungkyu Lee,Robert D. Moser +1 more
TL;DR: In this paper, a direct numerical simulation of incompressible channel flow at a friction Reynolds number of 5186 has been performed, and the flow exhibits a number of the characteristics of high-Reynolds-number wall-bounded turbulent flows.
Journal ArticleDOI
An approximate deconvolution procedure for large-eddy simulation
Steffen Stolz,Nikolaus A. Adams +1 more
TL;DR: An alternative approach to large-eddy simulation based on approximate deconvolution (ADM) is developed in this article, where the main ingredient is an approximation of the nonfiltered field by truncated series expansion of the inverse filter operator.
Book ChapterDOI
Benchmark Computations of Laminar Flow Around a Cylinder
TL;DR: An overview of benchmark computations for 2D and 3D laminar flows around a cylinder is given, which have been defined for a comparison of different solution approaches for the incompressible Navier-Stokes equations developed within the Priority Research Programme as mentioned in this paper.
Journal ArticleDOI
An approximate deconvolution model for large-eddy simulation with application to incompressible wall-bounded flows
TL;DR: In this article, an approximate deconvolution model for large-eddy simulation of incompressible flows is applied to turbulent channel flow and the effect of nonrepresented scales is modeled by a relaxation regularization involving a secondary filter operation.