DEM example with a particle discharge from a plate with ASC and LB (c…

…haos-polymtl#1191)

Description
The example is a simple case of particle discharging from a plate that compares the computational performance and the angle of repose of simulations using the Adaptive Sparse Contacts, the dynamic Load Balancing and both of them from a baseline simulation.
The simulations have 52000 particles and run under 45 minutes each.
This is the first example describing the ASC method.

Co-authored-by: Olivier Guévremont <guevremont.o@gmail.com>
Co-authored-by: hepap <47506601+hepap@users.noreply.github.com>

doc/source/examples/dem/dem.rst

@@ -21,6 +21,7 @@ We organize the DEM examples from the simplest to the most complicated example:
     silo/silo
     rectangular-hopper/rectangular-hopper
     granular-dam-break/granular-dam-break
+    plate-discharge/plate-discharge
     bunny-drill/bunny-drill
     granular-mixer/granular-mixer
 
@@ -59,9 +60,11 @@ We organize the DEM examples from the simplest to the most complicated example:
 
       dem_12 [label="Granular Dam-Break", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/granular-dam-break/granular-dam-break.html"];
 
-      dem_13 [label="Bunny Drill", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/bunny-drill/bunny-drill.html"];
+      dem_13 [label="Plate Discharge", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/plate-discharge/plate-discharge.html"];
 
-      dem_14 [label="Granular Mixer", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/granular-mixer/granular-mixer.html"];
+      dem_14 [label="Bunny Drill", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/bunny-drill/bunny-drill.html"];
+
+      dem_15 [label="Granular Mixer", href="https://chaos-polymtl.github.io/lethe/documentation/examples/dem/granular-mixer/granular-mixer.html"];
 
 
 
@@ -79,4 +82,5 @@ We organize the DEM examples from the simplest to the most complicated example:
       dem -> dem_12:w;
       dem -> dem_13:w;
       dem -> dem_14:w;
+      dem -> dem_15:w;
     }