Turbulence Model Sensitivity and Scour Gap Effect of Unsteady Flow around Pipe: A CFD Study

Table 1

Simulation cases.

Sim.*	Domain	Cases	Turbulence models	Positions (𝑋/𝐷)	Remarks
1	(1, 2, 3, 4, and 5); (0, 1, 6, 30, and 300 min)	1–6	Standard 𝑘-𝜀; RNG 𝑘-𝜀; Realizable 𝑘-𝜀; Standard 𝑘-𝜔; SST 𝑘-𝜔; RSM	3.0, 1.0, 1.5, and 2.0	To identify the preferred turbulence model
2	(1, 2, 3, 4, and 5); (10, 30, 100, 200, and 300 min)	7–11	Standard 𝑘-𝜀	0	To evaluate velocity profile under the pipe, 𝐶𝑝, wall shear stress, 𝐶𝑑, and 𝐶𝑙

∗Simulation.