In considered in this case. Mesh length for this

In this example a solitary wave hits a breakwater constructed with porous materials. The width of the breakwater is 0.5 m and its hight is larger than the hight of the water plus the wave amplitude. Some of wave height is transmitted through the barrier, some damps and the remaining reflects from the breakwater. Total domain length is 20 meter, and the breakwater is located in the middle of the domain. Thedepth of the domain is 40 cm and the amplitude of the solitary wave is 3.8 cm before impact the breakwater. The left boundary is specified as known elevations and right
boundary as closed boundary with zero velocities. Schematic view of problem and
its boundary conditions are shown in Fig. 11. Transmission coefficient ( ) specified as the
wave height ratio passsed through the breakwater to the entire wave height
and reflection coefficient( ) is defined as the ratio of the return wave height
to the total wave height. Madson49 presented an analyticalsolution for this problem, also Li et al. solved the
problem numerically23. For detailed information please see these references.
Breakwater porosity is 0.5 and different values has been considered for mean
grain diameter( ). Intrinsic permeability at each
diameter has been calculated using Equaion 6 with known value of porosity. Reynolds number in this problem is about 100
that is more than the range which is valid for linear assumption made by Darcy.
Thus, nonDarcy terms should be considered in this case. Mesh length for this
test has been considered as 4 cm and a schematic view of mesh plot and dimensions
are shown in Figure 12. Time intervals for present solutions have been
considered as 0.02 seconds. The results have been determined in the present study are reported at 5 different  and compared in Fig. 13 with the theoretical results
and also the numerical results of Li. et al. (2016). It should be mentioned
that the numerical results of Li. et al. (2016) had been determined based on
Control Volume method and NonDarcy assumption. As shown the results are in very good match with both theoretical and previous
numerical ones