id,summary,reporter,owner,description,type,status,priority,milestone,component,resolution,keywords,cc,workpackage 1234,add orientation distributions for Jeffery orbits,pkienzle,,"Ellipsoids in shear will exhibit tumbling with period related to the shear and aspect ratio. The distribution shape will change with aspect ratio. Need to create theta and phi distribution functions that capture joint distribution and check that they are separable (or nearly so). If not, need to figure out how to handle joint distributions on theta and phi is sasmodels. The work-around is to implement an Iqxy function which has parameters for the Jeffery distribution, but we will need a separate one for each shape, so not a good long-term solution. The following is a starting point: [Stover1990]: Stover, C.A., Cohen, C., 1990. The motion of rodlike particles in the pressure-driven flow between two flat plates. Rheologica Acta 29, 192–203. https://doi.org/10.1007/BF01331355 ",enhancement,new,major,sasmodels Next Release +1,sasmodels,,,,SasModels New Model