Models developed by [[User:Ruth V. Sabariego|R. Sabariego]], J. Gyselinck and [[User:Geuzaine|C. Geuzaine]]. This work was funded in part by the Walloon Region (WBGreen No 1217703 [[FEDO]], WIST3 No 1017086 [[ONELAB]]) and by the Belgian Science Policy (IAP P7/02). Copyright (c) 2012-2015 ULg-ULB.