We introduce a new variational method for the numerical homogenization of divergence form elliptic, parabolic and hyperbolic equations with arbitrary rough (L∞) coefficients. Our method does not rely on concepts of ergodicity or scale-separation but on compactness properties of the solution space and a new variational approach to homogenization. The approximation space is generated by an interpolation basis (over scattered points forming a mesh of resolution H) minimizing the L2 norm of the source terms; its (pre-)computation involves minimizing 𝒪(H-d) quadratic (cell) problems on (super-)localized sub-domains of size 𝒪(H ln(1/H)). The resulting localized linear systems remain sparse and banded. The resulting interpolation basis functions are biharmonic for d ≤ 3, and polyharmonic for d ≥ 4, for the operator -div(a∇·) and can be seen as a generalization of polyharmonic splines to differential operators with arbitrary rough coefficients. The accuracy of the method (𝒪(H) in energy norm and independent from aspect ratios of the mesh formed by the scattered points) is established via the introduction of a new class of higher-order Poincaré inequalities. The method bypasses (pre-)computations on the full domain and naturally generalizes to time dependent problems, it also provides a natural solution to the inverse problem of recovering the solution of a divergence form elliptic equation from a finite number of point measurements.
Mots-clés : homogenization, polyharmonic splines, localization
@article{M2AN_2014__48_2_517_0, author = {Owhadi, Houman and Zhang, Lei and Berlyand, Leonid}, title = {Polyharmonic homogenization, rough polyharmonic splines and sparse super-localization}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis }, pages = {517--552}, publisher = {EDP-Sciences}, volume = {48}, number = {2}, year = {2014}, doi = {10.1051/m2an/2013118}, mrnumber = {3177856}, zbl = {1296.41007}, language = {en}, url = {http://www.numdam.org/articles/10.1051/m2an/2013118/} }
TY - JOUR AU - Owhadi, Houman AU - Zhang, Lei AU - Berlyand, Leonid TI - Polyharmonic homogenization, rough polyharmonic splines and sparse super-localization JO - ESAIM: Mathematical Modelling and Numerical Analysis PY - 2014 SP - 517 EP - 552 VL - 48 IS - 2 PB - EDP-Sciences UR - http://www.numdam.org/articles/10.1051/m2an/2013118/ DO - 10.1051/m2an/2013118 LA - en ID - M2AN_2014__48_2_517_0 ER -
%0 Journal Article %A Owhadi, Houman %A Zhang, Lei %A Berlyand, Leonid %T Polyharmonic homogenization, rough polyharmonic splines and sparse super-localization %J ESAIM: Mathematical Modelling and Numerical Analysis %D 2014 %P 517-552 %V 48 %N 2 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/m2an/2013118/ %R 10.1051/m2an/2013118 %G en %F M2AN_2014__48_2_517_0
Owhadi, Houman; Zhang, Lei; Berlyand, Leonid. Polyharmonic homogenization, rough polyharmonic splines and sparse super-localization. ESAIM: Mathematical Modelling and Numerical Analysis , Multiscale problems and techniques. Special Issue, Tome 48 (2014) no. 2, pp. 517-552. doi : 10.1051/m2an/2013118. http://www.numdam.org/articles/10.1051/m2an/2013118/
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