This paper introduces a new, reduced-order NS- (rNS-) model for the purpose of efficient, stable, and accurate simulations of incompressible flow problems on coarse meshes. We motivate the new model by discussing the difficulties in efficient and stable algorithm construction for the usual NS- model, and then derive rNS- by using deconvolution as an approximation to the filter inverse, which reduces the fourth order NS- formulation to a second order model. After proving the new model is well-posed, we propose a finite element spatial discretization together with an IMEX BDF2 timestepping to create a linearized algorithm that decouples the conservation of mass and momentum equations from the filtering. We rigorously prove the algorithm is well-posed, and provided a very mild timestep restriction, is also stable and converges optimally to the model solution. Finally, we give results of several benchmark computations that confirm the theory and show the proposed model/scheme is effective at efficiently finding accurate coarse mesh solutions to flow problems.
DOI : 10.1051/m2an/2014053
Mots clés : Large Eddy Simulation, approximate deconvolution, finite element method, turbulent channel flow
@article{M2AN_2015__49_3_641_0, author = {Cuff, Victoria M. and Dunca, Argus A. and Manica, Carolina C. and Rebholz, Leo G.}, title = {The reduced order {NS-}$\alpha{}$ model for incompressible flow: theory, numerical analysis and benchmark testing}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {641--662}, publisher = {EDP-Sciences}, volume = {49}, number = {3}, year = {2015}, doi = {10.1051/m2an/2014053}, zbl = {1321.76032}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2014053/} }
TY - JOUR AU - Cuff, Victoria M. AU - Dunca, Argus A. AU - Manica, Carolina C. AU - Rebholz, Leo G. TI - The reduced order NS-$\alpha{}$ model for incompressible flow: theory, numerical analysis and benchmark testing JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2015 SP - 641 EP - 662 VL - 49 IS - 3 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2014053/ DO - 10.1051/m2an/2014053 LA - en ID - M2AN_2015__49_3_641_0 ER -
%0 Journal Article %A Cuff, Victoria M. %A Dunca, Argus A. %A Manica, Carolina C. %A Rebholz, Leo G. %T The reduced order NS-$\alpha{}$ model for incompressible flow: theory, numerical analysis and benchmark testing %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2015 %P 641-662 %V 49 %N 3 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2014053/ %R 10.1051/m2an/2014053 %G en %F M2AN_2015__49_3_641_0
Cuff, Victoria M.; Dunca, Argus A.; Manica, Carolina C.; Rebholz, Leo G. The reduced order NS-$\alpha{}$ model for incompressible flow: theory, numerical analysis and benchmark testing. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 49 (2015) no. 3, pp. 641-662. doi : 10.1051/m2an/2014053. http://www.numdam.org/articles/10.1051/m2an/2014053/
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