examples/navier-stokes.md

@@ -155,17 +155,13 @@ prob.addVectorOperator(opForce, _v);
 
 Numerical example
 -----------------
-We consider a square domain $`\Omega`$ with $`L_x=L_y=1`$ and Dirichlet boundary conditions
+We consider a lid-driven cavity problem in a square domain $`\Omega`$ with $`L_x=L_y=1`$
+no external force, and with Dirichlet boundary conditions
 ```math
 \mathbf{g} = \begin{pmatrix}0 \\ x_1(1 - x_1)(1 - x_0)\end{pmatrix}
 ```
 Thus, the boundary value is zero on top, right, and bottom boundary and parabolic
-on the left boundary.
-
-This is the lid-driven cavity problem, where we do not include any other external force
-term.
-
-The boundary condition is implemented, by first setting boundary ids for parts of
+on the left boundary. The boundary condition is implemented, by first setting boundary ids for parts of
 the grid boundary and second, setting the Dirichlet value:
 ```c++
 double vel = 1.0;