COMPUTATIONAL FLUID DYNAMIC SIMULATION OF FLOW VELOCITIES DISSIPATION BY MANGROVE ROOTS STRUCTURE
The study was investigating the velocity dissipation process of Avicennia marina and Rhizophora apiculata mangrove species by focusing on the root geometrical properties and the water flow structure within the root area. The root properties were investigated by conducting a field work. Hence, a model of the mangrove roots was constructed using the meshing software. The simulations were conducted in Computational Fluid Dynamic (CFD) software using unsteady Spalart-Allmaras turbulence model with
... bulence model with water liquid material and by setting the velocity inlet in boundary condition to 6 m/s. It had been observed that mangrove root properties and coordination had a high influence to the flow velocity reduction. An area that had high roots densities and cross-section diameters were capable of dissipating more velocities, especially within the distance 100 cm to 150 cm from the primary trunk. The study also discovered that the contact between jets, eddies, turbulence scale and stagnation areas were contributing to the velocity deficit. The simulation result shows that mangrove roots of both species were capable of decreasing the initial velocity 6 m/s of water flow to almost 2 m/s. The flow velocity dissipation rate and flow structure in the mangrove root area found through this study will provide valuable data in increasing the efficiency of current breakwater models.