add comments about load balancing granular sims and typo in qb biseg

docs/source/InputsLoadBalancing.rst

@@ -51,6 +51,11 @@ The following inputs must be preceded by "particles"
 |                   | in the ParticleBoxArray if dual_grid is true.                         |             |              |
 +-------------------+-----------------------------------------------------------------------+-------------+--------------+
 
+Note that when running a granular simulation, i.e., no fluid phase, :cpp:`mfix.dual_grid` must be 0. Hence, 
+the :cpp:`particles.max_grid_size` (in each direction) have no meaning. Therefore the fluid grid and tile 
+sizes should be set for particle load balancing. It may also be necessary to set the blocking factors to 1. 
+
+
 The following inputs must be preceded by "mfix" and determine how we load balance:
 
 +----------------------+-----------------------------------------------------------------------+-------------+--------------+

docs/source/qb/biseg.rst

@@ -9,8 +9,8 @@ of nylon
 and ceramic 
 (:math:`d_p = 4.25` mm, :math:`\rho_p = 2580` kg/m\ :sup:`3` \)
 particles. When fluidized, the smaller, lighter nylon particles 
-(:math:`U_{mf} ~ 1.1` m/s) segregate out of the mixture to the top, 
-with the larger, heavier ceramic particles  (:math:`U_{mf} ~ 1.8` m/s)
+(:math:`U_{mf} \approx 1.1` m/s) segregate out of the mixture to the top, 
+with the larger, heavier ceramic particles  (:math:`U_{mf} \approx 1.8` m/s)
 remaining at the bottom. The batch segregation test was conducted in 
 a small bed with a square cross-section of side length 60.325 mm. 
 Similar to previous observations of fluidized segregation of