scholarly journals Research onFlows for NACA 2412 Airfoil using Computational Fluid Dynamics Method

2019 ◽  
Vol 9 (1) ◽  
pp. 5450-5456 ◽  
Keyword(s):  
Compressible Flow ◽  
Incompressible Flow ◽  
Flow Direction ◽  
Lift Coefficient ◽  
Flow Characteristics ◽  
Variable Density ◽  
Flow Conditions ◽  
Velocity Magnitude ◽  
Variable Density Flow ◽  
Density Flow

The comparison between incompressible and compressible flow for aerodynamic coefficients and flow characteristics has been made for NACA 2412 airfoil. The FEM is used to obtain results. The fluid domain of 10C has been constructed to initialize the boundary conditions of incompressible and compressible flow conditions. The structured mesh has been applied in order to achieve accurate results. The Spallart-Allmaras turbulence model has been used to solve both incompressible and compressible flow conditions. The method validation that has been conducted at incompressible flow has shown close agreement between numerical and experimental lift coefficient. From velocity magnitude and static pressure, contours, the compressible flow has the highest-pressure distribution compared to incompressible flow. Therefore, it has been proven that the coefficient of force at ninety degrees to the direction of the flow direction of the airfoil subjected to a variable density flow was much higher compared to incompressible flow.

Numerical Verification of the Solutions for Groundwater Flow in a Coastal Extensive Land Mass

2013 ◽  
Vol 864-867 ◽  
pp. 2292-2297
Author(s):  
Hai Peng Guo
Keyword(s):  
Analytical Solutions ◽  
Land Reclamation ◽  
Variable Density ◽  
Numerical Code ◽  
Numerical Verification ◽  
Variable Density Flow ◽  
Density Flow ◽  
Type Flow ◽  
Land Mass ◽  
The Impact

This paper reviews the analytical solutions for the impact of land reclamation on the ground water level and the saltwater interface with unconfined groundwater conditions in coastal aquifers. The applicability of the analytical solutions is somewhat limited by assumptions such as Dupuit-type flow and the Ghyben-Herzberg relation. Variable-density flow and solute transport simulations conducted by the numerical code FEFLOW were used to evaluate the accuracy of these analytical solutions. Three field-scale hypothetical cases were simulated for the numerical verification. The results show that a seepage face occurs in the numerical results rather than in the analytical solutions, but only minor difference occurs between the numerical and analytical solutions. This implies that the analytical solutions are reasonable despite the used assumptions.

On the generation of instabilities in variable density flow

1994 ◽  
Vol 30 (4) ◽  
pp. 913-927 ◽  
Author(s):  
Robert A. Schincariol ◽  
Franklin W. Schwartz ◽  
Carl A. Mendoza
Keyword(s):  
Variable Density ◽  
Variable Density Flow ◽  
Density Flow

scholarly journals Experimental and Numerical Studies on the Vertical Flow of Variable Density Fluid in Different Directions

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Zhifang Zhou ◽  
Boran Zhang ◽  
Qiaona Guo ◽  
Shumei Zhu
Keyword(s):  
Salt Water ◽  
Water Injection ◽  
Experimental Studies ◽  
Engineering Application ◽  
Variable Density ◽  
Vertical Flow ◽  
Construction Time ◽  
One Dimensional ◽  
Variable Density Flow ◽  
Density Flow

Injecting freshwater and pumping salt water are effective methods to restore the salt water in a coastal area. Based on a one-dimensional vertical experiment, the variable density flow is simulated under the condition of different injection directions and injection rates of fresh water. A one-dimensional mathematical model of variable density flow and solute transport is established. The mathematical models are solved using the implicit difference method. Fortran code is developed to simulate and verify the vertical flow of variable density flow in different directions. Through both numerical simulation and experimental studies, it is found that the variable density fluid in the direction of reverse gravity is different from that in the direction of gravity. On this basis, the most effective desalination model of salt water is further discussed. It provides a theoretical and technical method for the restoration of salt water in the vertical injection of freshwater. In order to improve the remediation efficiency and reduce the cost in the engineering application, the suitable water injection rate should be ensured, considering the suitable construction time and zone of a study area.

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