@article{Goldade:2020:CBAR, author = {Goldade, Ryan and Aanjaneya, Mridul and Batty, Christopher}, title = {Constraint Bubbles and Affine Regions: Reduced Fluid Models for Efficient Immersed Bubbles and Flexible Spatial Coarsening}, year = {2020}, issue_date = {July 2020}, publisher = {Association for Computing Machinery}, address = {New York, NY, USA}, volume = {39}, number = {4}, issn = {}, url = {}, doi = {}, journal = {ACM Trans. Graph.}, month = jul, articleno = {Article 43}, numpages = {15}, keywords = {} }