Week 5 - Rayleigh Taylor Instability

introduction The Ahmed body was first created by SR Ahmed in his research "some salient feature of the time-averaged ground vehicle wake" in 1984. Ahmed body is the benchmark model for aerodynamics simulation tools. the simple geometrical shape has a length of  1.044 meters, a height of 0.288 meters, and a width of…

introduction The cross-sections of wind turbine blades have the shape of airfoils. The airfoils are structures with specific geometric shapes that are used to generate mechanical forces due to the relative motion of the airfoil and a surrounding fluid [1]. The shape of the airfoil greatly influences the aerodynamic…

introduction  Reynolda number  the Reynolds number is the ratio of inertia force to viscous force within a fluid that is being subjected to relative internal movement due to different fluid velocities which is known as a boundary layer in case bounding surface such as the interior of the pipe. Reynolds decomposition…

introduction  the shock tube is an instrument to direct blast waves at a sensor or model to simulate an actual explosion and its effects. the stock tubes, for instance, are used to study aerodynamics under a wide range of temperature and pressure also it is used to see compressible flow phenomena and gas phase combustion…

introduction A throttle body is essentially a large air valve that sits between the intake manifold and the air intake pipe, an engine has one throttle body, which bolts to the intake manifolds plenum. a throttle body controls airflow into the engine, a crucial factor for controlling the engine's air/fuel ratio. throttle…

Types of boundary conditions  1)Dirichlet boundary condition -it indicates the value of the unknown function of that long domain.   2)Neumann boundary condition- it indicates the derivative of the solution is normal to the boundary domain.                     …

introduction conjugate heat transfer conjugate heat transfer corresponds with the combination of heat transfer in solids and heat transfer in the fluid. in solid, conduction is often domain whereas in fluid convection usually domain conjugate heat transfer is observed in many situations .for eggs heat sinks super-cycling…

introduction  A throttle body is essentially a large air valve that sits between the intake manifold and the air intake pipe, an engine has one throttle body, which bolts to the intake manifolds plenum. a throttle body controls airflow into the engine, a crucial factor for controlling the engine's air/fuel ratio.…

introduction   Flow over a backward-facing step is a common phenomenon in practical engineerings, such as the internal flow in diffuse, turbine, combustion, pipes, and external flow over aircraft. one representative separation flow model, which is of significance in both theoretical and engineering development  …

introduction  flow in conduits or channels are interested in science, engineering, and everyday life channel flow occurs when the upstream water level of outflow is higher than the water level downstream. channel flow may be shooting or streaming. 1. open channel  flow: in this type of flow only for liquids,…

Introduction conjugate heat transfer the conjugate heat transfer analysis type allows for simulation of heat transfer between solid and fluid domains by exchanging thermal energy at the interfaces between them. typical applications of this analysis type exist as but are not limited to, simulation of the heat exchanger,…

Obtain the mass flow rates at the outlet for each design point. Calculate the flow coefficient and flow factor for each opening and plot the graph. Discuss the results of the mass flow rate and flow coefficient.  Introduction The Gate valve is a linear actuating valve used as a flow isolator in a fluid pipeline.…

Geometry   meshing                 problem setup         part one                              part 2 10% water 90% fule                  …

Introduction  cyclone separators are separation devices that use the principle of inertia to remove particulate matter from flue gases .cyclone separator is one of many air pollution control devices known as pre-cleaners since they generally remove large pieces of particulate matter, this prevents finer filtration…

RT instability is the instability of an interface between two fluids of different densities which occurs when the lighter fluid is pushing the heavier fluid .water suspended atop oil is an everyday example of Rayleigh Taylor and it may be modeled by two completely plane-parallel layers of immiscible fluid the denser on…

CONJUGATE HEAT TRANSFER  introduction this type of heat transfer corresponds to a combination of the heat transfer in solids and heat transfer in fluids .heat transfer in solid is called conduction and heat transfer in a fluid is called convection.  conduction occurs due to the Direct molecular collision. the…

The Ahmed body was first created by SR Ahmed in his research "some salient feature of the time-averaged ground vehicle wake" in 1984. Ahmed body is the benchmark model for aerodynamics simulation tools. the simple geometrical shape has a length of  1.044 meters, a height of 0.288 meters, and a width of 0.389 meters…

introduction In this, we will analyze flow over a cylinder for different Re for both steady and unsteady cases and find the Strouhal number which will show how Karman vortex street generated. The Strouhal number is defined as St = fstD/U, where fst is the vortex shedding frequency (or the Strouhal frequency)…

case 1  Short mixing tee with a hot inlet velocity of 3m/s. Geometry    mesh  *autometed genaretd mesh total number of nodes 2881 total number of elemants 123984     Momentum ratio of 2.   Residuals graph Number of iterations for convergence at 420 total number of iterations given…

there are total 4 numerical methods  1) Finite Element Method(FEM) 2)Boundary Element Method(BEM) 3)Finite Volume Method (FVM) 4)Finite Difference Method(FDM) FVM The finite-volume method is similar to the finite differencing method in that the CAD model is divided into very small but finite sized elements of geometrically…

     1)Pre Processing 2)processing 3)post-processing The pre-processing  Geometry creation  chooses suitable files from Open foam tutorials for your problem case. Any problem statement consisting of suitable data from that one should understand which problem we should edit. every OpenFoam consists…

 non-conservation forms clear all close all clc %inputs n=31 x=linspace(0,3,n) dx=x(2)-x(1) gamma=1.4 %cfl=max((v+sqrt(t))*dt/dx) %calculate intial profiles rho=1-0.316*x; t=1-0.2314*x; % t=temprature v=(0.1+1.09*x).*t.^0.5; %cfl=max((v+sqrt(t))*dt/dx) %area a=1+2.2*(x-1.5).^2; %time stpes nt=1000 dt=0.001; %outer…

Steady state analysis & Transient State Analysis Solve the 2D heat conduction equation by using the point iterative techniques that were taught in the class. The Boundary conditions for the problem are as follows; Top Boundary = 600 K Bottom Boundary = 900 K Left Boundary = 400 K Right Boundary = 800 K    …

central differencing  No of nodes =p+q-1  where p is the order of derivative            q is the order of approximation   the number of nodes=2+4-1=5 Taylor table c dx^2f''(i)          f(i)        f'(i)dx       …