385 IGPM385.pdf        March 2014
TITLE Hierarchical Tensor Approximation of Output Quantities of Parameter-Dependent PDEs
AUTHORS Jonas Ballani, Lars Grasedyck
ABSTRACT Parametric PDEs appear in a large number of applications, as, e.g., in uncertainty quantification or optimisation. In many cases, one is interested in scalar output quantities induced by the parameter-dependent solution. The output can be interpreted as a tensor living on a high-dimensional parameter space. Our aim is to adaptively construct an approximation of this tensor in a data-sparse hierarchical tensor format. Once this approximation from an offline computation is available, the evaluation of the output for any parameter value becomes a cheap online task. Moreover, the explicit tensor representation can be used to compute stochastic properties of the output in a straightforward way. The potential of this approach is illustrated by numerical examples.
KEYWORDS hierarchical Tucker, low rank tensor, SPDE, cross approximation, sampling