Warning: Undefined array key 1 in /home/np29546/public_html/elmerice/wiki/inc/auth.php on line 78

Warning: Cannot modify header information - headers already sent by (output started at /home/np29546/public_html/elmerice/wiki/inc/auth.php:78) in /home/np29546/public_html/elmerice/wiki/inc/auth.php on line 431

Warning: Cannot modify header information - headers already sent by (output started at /home/np29546/public_html/elmerice/wiki/inc/auth.php:78) in /home/np29546/public_html/elmerice/wiki/inc/Action/Export.php on line 104

Warning: Cannot modify header information - headers already sent by (output started at /home/np29546/public_html/elmerice/wiki/inc/auth.php:78) in /home/np29546/public_html/elmerice/wiki/inc/Action/Export.php on line 104

Warning: Cannot modify header information - headers already sent by (output started at /home/np29546/public_html/elmerice/wiki/inc/auth.php:78) in /home/np29546/public_html/elmerice/wiki/inc/Action/Export.php on line 104
====== Inverse Methods ====== Two variational inverse methods have been implemented within Elmer/Ice to inverse either the basal friction coefficient field beta(x,y) or the fluidity parameter A(x,y,z). Both methods are based on the minimisation of a cost function that measures the mismatch between modelled and observed velocities. These two methods are:\\ * the linear adjoint method, following Morlighem et al. (2010) * a Robin type method, from Arthen and Gudmundsson (2010) //some info about the Robin type method, in the outputfile related to the costfunction the columns follow this convention:\\ 1st column: number of iteration\\ 2nd column: total cost function\\ 3rd column: surface term of the cost function measuring the mismatch between Neumann and Dirichlet problem\\ 4th column: integral on the beta of the derivative of beta (penalisation term) \\ For the Lambda-curve plot column 4 has to be plotted against column 3 for different values of lambda. Note, that it is $2=$3+0.5*lambda$4". // Adjoint inverse methods have been re-organised in Spring 2020; documentation is available with the elmerice sources [[https://github.com/ElmerCSC/elmerfem/tree/elmerice/elmerice/Solvers/Documentation|here]].