Physical and CFD Simulated Models to Analyze the Contaminant Transport through Porous Media under Hydraulic Structures
- PDF / 4,458,785 Bytes
- 18 Pages / 595 x 786 pts Page_size
- 69 Downloads / 208 Views
pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1767-6
Hydraulic Engineering
Physical and CFD Simulated Models to Analyze the Contaminant Transport through Porous Media under Hydraulic Structures Sadiq S. Muhsun
a
, May Samir Saleh
b
, and Ali R. Qassim
b
a
Water Resources Engineering Department, College of Engineering, Mustansiriyah University, Baghdad 10047, Iraq Dept. of Water Resources, College of Engineering, Mustansiriyah University, Baghdad 10047, Iraq
b
ARTICLE HISTORY
ABSTRACT
Received 19 October 2019 Revised 29 March 2020 Accepted 3 May 2020 Published Online 15 September 2020
In this paper the efforts were made in the laboratory to construct a physical model and a simulated model with the help of computational fluid dynamic (CFD) techniques to provide the solutions of contaminant transport within the saturated porous media under a hydraulic structure. Brinkman equations with Forchheimer correction and species flow through porous media were considered together to describe the problem. Three categories factors were considered to be analyzed in this study. The first one is the hydraulic factors represented in the upstream water head (H). While, the second factor is the geometry of the hydraulic structures represented in the length of the base and the length of the sheet pile. The physical properties and chemical properties were the third investigated factors, in which the physical properties of the porous media include porosity and intrinsic permeability, while the chemical properties represented by the rate of generation and retardation caused by the adsorption. The physical properties have a slight effect on the concentrations because of the low flow velocity through the porous media. On the other hand, a considerable decrement on the concentrations were noticed when the rate of generation and retardation caused by adsorption was increased. Also, it was observed that the diffusion coefficient has no dramatic effect on the concentrations and contaminant moving. The results of the CFD simulated model and that of the physical model were verified with two cases for pressure head and one case for the contaminates transport. For the first case of pressure head, the maximum percentage error at five selected points was about 15% at worst point with average error of 10%. While, for the case two, the maximum percentage error is about 9% at worst one with an average error of 8%. For the simulation of the contaminates transport, reliable statistical indexes error indicted that the CFD simulated model gives a good agreement with all experimental results.
KEYWORDS Soil contaminant transport Porous media Contaminant numerical modelling FCD model Brinkman Forchheimer flow
1. Introduction The contaminant transport through the porous media under the hydraulic structure considered as a chief problem of waste disposals in the soil. Recent field studies by Penrose et al. (1990) show that when the colloids may migrate at velocities similar to the same value of the flow in the soil
Data Loading...
