Loading doc/fix_rigid.html +9 −17 Original line number Diff line number Diff line Loading @@ -171,23 +171,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the temperature (and pressure) computation, but only if the temperature group includes all the particles in a particular rigid body. </P> <P>For rigid bodies consisting of point particles, a 3d body has 6 degrees of freedom (3 translational, 3 rotational), except for a dimer which only has 5. A 2d body has 3 degrees of freedom (2 translational, 1 rotational). </P> <P>For rigid bodies containing one or more finite-size particles, a 3d body has 6 degrees of freedom, while a 2d body has 3. </P> <P>IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more point particles in a straight line. Linear rigid bodies in 3d have 5 degrees of freedom (like a dimer) instead of 6, but LAMMPS will not detect this. Thus if your model contains linear rigid bodies you should use the <A HREF = "compute_modify.html">compute_modify</A> command to subtract an additional degree of freedom for each one. You may also wish to explicitly subtract additional degrees-of-freedom if you use the <I>force</I> and <I>torque</I> keywords to eliminate certain motions of the rigid body, as LAMMPS does not do this automatically. <P>A 3d rigid body has 6 degrees of freedom (3 translational, 3 rotational), except for a collection of point particles lying on a straight line, which has only 5, e.g a dimer. A 2d rigid body has 3 degrees of freedom (2 translational, 1 rotational). </P> <P>IMPORTANT NOTE: You may wish to explicitly subtract additional degrees-of-freedom if you use the <I>force</I> and <I>torque</I> keywords to eliminate certain motions of one or more rigid bodies, as LAMMPS does not do this automatically. </P> <P>The rigid body contribution to the pressure of the system (virial) is also accounted for by this fix. Loading doc/fix_rigid.txt +9 −17 Original line number Diff line number Diff line Loading @@ -162,23 +162,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the temperature (and pressure) computation, but only if the temperature group includes all the particles in a particular rigid body. For rigid bodies consisting of point particles, a 3d body has 6 degrees of freedom (3 translational, 3 rotational), except for a dimer which only has 5. A 2d body has 3 degrees of freedom (2 translational, 1 rotational). For rigid bodies containing one or more finite-size particles, a 3d body has 6 degrees of freedom, while a 2d body has 3. IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more point particles in a straight line. Linear rigid bodies in 3d have 5 degrees of freedom (like a dimer) instead of 6, but LAMMPS will not detect this. Thus if your model contains linear rigid bodies you should use the "compute_modify"_compute_modify.html command to subtract an additional degree of freedom for each one. You may also wish to explicitly subtract additional degrees-of-freedom if you use the {force} and {torque} keywords to eliminate certain motions of the rigid body, as LAMMPS does not do this automatically. A 3d rigid body has 6 degrees of freedom (3 translational, 3 rotational), except for a collection of point particles lying on a straight line, which has only 5, e.g a dimer. A 2d rigid body has 3 degrees of freedom (2 translational, 1 rotational). IMPORTANT NOTE: You may wish to explicitly subtract additional degrees-of-freedom if you use the {force} and {torque} keywords to eliminate certain motions of one or more rigid bodies, as LAMMPS does not do this automatically. The rigid body contribution to the pressure of the system (virial) is also accounted for by this fix. Loading Loading
doc/fix_rigid.html +9 −17 Original line number Diff line number Diff line Loading @@ -171,23 +171,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the temperature (and pressure) computation, but only if the temperature group includes all the particles in a particular rigid body. </P> <P>For rigid bodies consisting of point particles, a 3d body has 6 degrees of freedom (3 translational, 3 rotational), except for a dimer which only has 5. A 2d body has 3 degrees of freedom (2 translational, 1 rotational). </P> <P>For rigid bodies containing one or more finite-size particles, a 3d body has 6 degrees of freedom, while a 2d body has 3. </P> <P>IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more point particles in a straight line. Linear rigid bodies in 3d have 5 degrees of freedom (like a dimer) instead of 6, but LAMMPS will not detect this. Thus if your model contains linear rigid bodies you should use the <A HREF = "compute_modify.html">compute_modify</A> command to subtract an additional degree of freedom for each one. You may also wish to explicitly subtract additional degrees-of-freedom if you use the <I>force</I> and <I>torque</I> keywords to eliminate certain motions of the rigid body, as LAMMPS does not do this automatically. <P>A 3d rigid body has 6 degrees of freedom (3 translational, 3 rotational), except for a collection of point particles lying on a straight line, which has only 5, e.g a dimer. A 2d rigid body has 3 degrees of freedom (2 translational, 1 rotational). </P> <P>IMPORTANT NOTE: You may wish to explicitly subtract additional degrees-of-freedom if you use the <I>force</I> and <I>torque</I> keywords to eliminate certain motions of one or more rigid bodies, as LAMMPS does not do this automatically. </P> <P>The rigid body contribution to the pressure of the system (virial) is also accounted for by this fix. Loading
doc/fix_rigid.txt +9 −17 Original line number Diff line number Diff line Loading @@ -162,23 +162,15 @@ degrees-of-freedom removed by each rigid body are accounted for in the temperature (and pressure) computation, but only if the temperature group includes all the particles in a particular rigid body. For rigid bodies consisting of point particles, a 3d body has 6 degrees of freedom (3 translational, 3 rotational), except for a dimer which only has 5. A 2d body has 3 degrees of freedom (2 translational, 1 rotational). For rigid bodies containing one or more finite-size particles, a 3d body has 6 degrees of freedom, while a 2d body has 3. IMPORTANT NOTE: A "linear rigid body" is one consisting of 3 or more point particles in a straight line. Linear rigid bodies in 3d have 5 degrees of freedom (like a dimer) instead of 6, but LAMMPS will not detect this. Thus if your model contains linear rigid bodies you should use the "compute_modify"_compute_modify.html command to subtract an additional degree of freedom for each one. You may also wish to explicitly subtract additional degrees-of-freedom if you use the {force} and {torque} keywords to eliminate certain motions of the rigid body, as LAMMPS does not do this automatically. A 3d rigid body has 6 degrees of freedom (3 translational, 3 rotational), except for a collection of point particles lying on a straight line, which has only 5, e.g a dimer. A 2d rigid body has 3 degrees of freedom (2 translational, 1 rotational). IMPORTANT NOTE: You may wish to explicitly subtract additional degrees-of-freedom if you use the {force} and {torque} keywords to eliminate certain motions of one or more rigid bodies, as LAMMPS does not do this automatically. The rigid body contribution to the pressure of the system (virial) is also accounted for by this fix. Loading
