Session

Session 11 2022

Start Date

10-27-2022 12:00 AM

Abstract

In this work, a numerical model Sediment Simulation In Intakes with Multiblock option (SSIIM) is developed to analyse the effect of pier spacing on the scour process around side by side and staggered piers. Both �� − �� and �� − �� turbulence models are employed to solve the eddy viscosity flow equations and their performances are evaluated. From the initial observations it is concluded that, when the spacing between the piers is negligible, then both the piers behave like a single pier and the scour depth is found to be more than 42% than that of a single pier. However, when the clear spacing between piers is more than 1.5 times pier diameter (D) for both arrangements the piers behaved independently. Furthermore, the numerical model is skill-assessed for two different piles spacing S|D in side by side piers and in staggered arrangements. While the model is effective in reproducing the scour depth in front of piers for side by side piers, it overestimated the bed scour depth between the piers, however, it underestimated the scour depth in front piers in the staggered arrangements. The results show that the SSIIM program can be used efficiently for simulating the scouring in natural rivers and good agreements are achieved between the piers in different arrangements.

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Oct 27th, 12:00 AM

Numerical Modelling of Scour and Flow Field for Two Different Arrangements of Piers Using SSIIM Model

In this work, a numerical model Sediment Simulation In Intakes with Multiblock option (SSIIM) is developed to analyse the effect of pier spacing on the scour process around side by side and staggered piers. Both �� − �� and �� − �� turbulence models are employed to solve the eddy viscosity flow equations and their performances are evaluated. From the initial observations it is concluded that, when the spacing between the piers is negligible, then both the piers behave like a single pier and the scour depth is found to be more than 42% than that of a single pier. However, when the clear spacing between piers is more than 1.5 times pier diameter (D) for both arrangements the piers behaved independently. Furthermore, the numerical model is skill-assessed for two different piles spacing S|D in side by side piers and in staggered arrangements. While the model is effective in reproducing the scour depth in front of piers for side by side piers, it overestimated the bed scour depth between the piers, however, it underestimated the scour depth in front piers in the staggered arrangements. The results show that the SSIIM program can be used efficiently for simulating the scouring in natural rivers and good agreements are achieved between the piers in different arrangements.