To solve this problem two methods are usually considered: (1) Construct adaptive high order intergrid transfer operators as in [1]; (2) apply extra smoothing steps only in ΩE as in [5, 9] in an adaptive way.
To solve this problem two methods are usually considered: (1) Construct adaptive high order intergrid transfer operators as in [1]; (2) apply extra smoothing steps only in ΩE as in [5, 9] in an adaptive way.