What are "Floppy Groups"?

[kmo...@ucsb.edu]

Hi all,

I'm looking at creating rigid bodies that are connected to a polymer through a harmonic bond. When I was going through documentation to create rigid body groups, and I see that there is a description of body types, with -1 as a nonrigid body, 0 and up as a rigid body, and then -2 and below as a "floppy" body. Has anyone encountered those before? Are they just deprecated descriptions?

I have included the links below.

Thank you,

Kevin

https://hoomd-blue.readthedocs.io/en/stable/module-hoomd-group.html?highlight=floppy#hoomd.group.floppy

https://hoomd-blue.readthedocs.io/en/stable/module-hoomd-data.html?highlight=floppy#hoomd.data.particle_data_proxy.body

[Joshua Anderson]

Kevin,

No, do not use the -2 "floppy body" index for this. It was added for to support some functionality that was not implemented.

You can make two separate rigid bodies, then add a harmonic bond between a particle in one body with a particle on the other body.
------
Joshua A. Anderson, Ph.D.
Research Area Specialist, Chemical Engineering, University of Michigan

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