[lammps-users] Error due to fix rigid for larger group

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Hi all,

Here is the description of my problem:

  1. Modeled a Smaller sphere say of approximately 3 nm and used “fix rigid” for the atoms.

  2. Made this sphere interact with a rectangle using LJ potential between the sphere and the rectangle.

  3. The simulations ran sucessfully and the results make sense.

But when I tried to model a larger sphere say of approximately 10 nm and used “fix rigid” for the atoms, during the simulation, it returned an error “BAD PRINCIPAL MOMENTS”. I would like to know what could be done to overcome this error, as I need to run a case of 30 nm sphere in the future.

Thanks in advance,
Peri.