0001315: Typo in overlapArea in lagrangian (DEM) framework - issue only for multimodal particle simulations

ID	Project	Category	View Status	Date Submitted	Last Update

0001315	OpenFOAM	Bug	public	2014-06-05 10:53	2014-06-05 11:34

Reporter	~~user940~~	Assigned To	henry
Priority	normal	Severity	trivial	Reproducibility	always
Status	resolved	Resolution	fixed
Platform	Linux	OS	OpenSuse	OS Version	11.3

Summary	0001315: Typo in overlapArea in lagrangian (DEM) framework - issue only for multimodal particle simulations
Description	Hi, in the lagrangian framework, there is a typo in the formula for the overlap area. In file src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/PairCollision/PairModel/PairSpringSliderDashpot/PairSpringSliderDashpot.H in line 152 it should read: ( rAB + rA + rB) instead of: ( rAB + rA + rA) Can be verified at the original reference (http://mathworld.wolfram.com/Sphere-SphereIntersection.html) of the expression. This bug doesn't harm in monomodal (same diameter) DEM simulations, but in simulations with varying diameters it causes wrong forces. The same function (including the typo) is also defined in the other force models by the way: ./submodels/Kinematic/CollisionModel/PairCollision/PairModel/PairPiecewiseLinearCohesive/PairPiecewiseLinearCohesive.H-132 Best regards Thomas
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Date Modified	Username	Field	Change
2014-06-05 10:53	~~user940~~	New Issue
2014-06-05 11:34	henry	Note Added: 0003101
2014-06-05 11:34	henry	Status	new => resolved
2014-06-05 11:34	henry	Resolution	open => fixed
2014-06-05 11:34	henry	Assigned To	=> henry

henry 2014-06-05 11:34 manager ~0003101	Thanks for the detailed bug-report. Resolved by commit e979271011714a2ce7adc9b5beb2c5117dfda0ad PairPiecewiseLinearCohesive is not known to us.