Week 7 - Simulation of a 1D Super-sonic nozzle flow simulation using Macormack Method

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Aim To perform a CFD Analysis on Combustion in a SCRAMJET engine using different injector angles ,wedge angles and to find its combustion efficiency. Introduction  A scramjet (supersonic combustion ramjet) is a variant of a ramjet airbreathing jet engine in which combustion takes place in supersonic…

Aim To simulate the motion of blades in a generic turbomachinery component using an unsteady approach assuming the blade rotation at 300 rpm. Procedure The 2-d diagram had 3 domains ,all of them were put together in FLUENT. The viscous model used for both is k-epsilon realizable. RPM - 300         …

Turbulent flows are characterised by a large range of vortical structures at different scales, both in time and space, which interact with each other and exchange energy. The largest scales contain most of the kinetic energy for the flow. As larger structures are broken into smaller ones, this energy is transferred to…

Describe Ahmed's body and its importance. -->As the burning of fossil fuels becomes a more pressing issue, manufacturers are introducing more fuel efficient cars to the market. One main contributor to fuel burn is the car’s aerodynamic drag. Complexly shaped, cars are very challenging to model and it’s difficult…

1.What are the approaches by which you would model moving zones? Moving Reference Frame (MRF) The MRF model is the simplest of the two approaches for multiple zones. It is a steady-state approximation in which individual cell zones move at different rotational and/or translational speeds. The flow in each moving cell zone…

No ICEM for challenge 6

Aim      To perform a fluid flow simulation in the given enclosed pitot-static tube and to calculate the error percentage for velocity  .  Introduction This page shows a schematic drawing of a pitot-static tube. Pitot-Static tubes, which are also called Prandtl tubes, are used on aircraft…

Aim To plot the pressure, velocity, temperature & the variation of Mach number across the domain . Introduction A de Laval nozzle or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube which is pinched in the middle, making a carefully balanced, asymmetric hourglass shape. It…

Aim To check ,solve all geometrical errors,assign appropriate PID,s,perform meshing with the suitable target length and element quality criteria for the given model. Procedure 1.The model was opened as it is on ANSA           2. After we hit a topo on the geometry we got fewer red cons. 3.Then…

Aim To check for the geometrical errors, delete surfaces which are unwanted for Surface wrap & merging of all 3 models and to perform surface wrap for the given models. Introduction Surface wrap is the process of meshing only the outside surface of a particular component.The parts inside will be kept as it is.This…

Aim To Check and solve all geometrical errors , Assigning appropriate PID's & to perform a CFD mesh on a BMW car with the given target length and element quality criteria. Procedure 1.The file is opened in ANSA as it is.                 2.Since the geometry of the car was axisymmetric…

Aim To mesh different parts of a turbocharger with the above given target values. Introduction A turbocharger  is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas,forcing more air into the engine in order to produce more power for…

Aim Surface meshing on a pressure valve. Introduction A pressure control valve can protect a system from the damages which is caused by excessive pressure. These valves can do the pressure control of a system an example for this is, using a line relief valve to limit the maximum allowable system pressure. These valves…

Aim To perform a simulation for combustion of natural gas. Introduction Natural gas is an extremely important source of energy for reducing pollution and maintaining a clean and healthy environment. In addition to being domestically abundant and secure source of energy,the use of natural gas also offers a number of environmental…

Aim Performing a parametric study on the gate valve simulation by setting the opening from 10 % to 80%.  Introduction  A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe…

Aim To perform analysis on cyclone separator and calculate the separation efficiency and pressure drop. Introduction Cyclones are devices that employ a centrifugal force generated by spinning gas stream to separate particles from the carrier gas. Their simple design, low maintanence costs and adaptability to wide range…

Aim To perform a steady state conjugate heat transfer analysis on a model of a graphics card by using appropriate materials . Then the simulation is run with the best possible mesh with combination of coasrse and refined in different regions. Introduction CHT (Conjugate Heat Transfer) The CHT Analysis type allows for the…

Aim To demostrate a Rayleigh-taylor instability Objectives Some practical models based on Rayleigh-Taylor waves 1.Saffman-Taylor instability Also called as viscous fingering it occurs when a less viscous fluid is injected displacing a more viscous fluid.In a CFD application this method is usually observed in Hele-Shaw…

Aim To create a CHT analysis on an exhaust port of a 4-cylinder engine. objectives and results 1.Give a brief description of why and where a CHT analysis is used.  --> CHT analysis is used to generate increase resolution thermal inputs on the stage wetted surfaces. Whereas the standard approaches uses constant…

Aim To modify the given given geometry using the split command in spaceclaim to perform the operation and then by using the symmetry condition in fluent the simulation is performed. As the body is symmetric the simulation was run only on half of the body .By doing this a huge number of cells were saved and the simulation…

 Aim To stimulate the flow over a cylinder and axplaining the Karmen vortex street Objectives Part 1 To stimulate the flow with steady and unsteady case and calculating the Strouhal number for Re=100 Part 2 1.To calculate the coefficient of drag and lift over the cylinder by setting Re=10,100,1000,10000,100000 2.Discussing…

Objective; Here we have to set up a steady state simulation to compare mixing effectiveness when hot inlet temperature is 36 C and cold inlet temperature is 19C. Procedure: In these 2 cases we will use the k-omega model is used as it converged after a given number of iterations, this was not observed in the condition of…

Objective In this challenge, we are going to simulate an incompressible-laminar-viscous flow through the backward facing step geometry. We are performing a transient simulation. The solver is chosen based on the described physics of the flow.   Procedure The first step is to use the tutorials folder in openfoam. In…

Finite volume method (FVM); It is a method for representing and evaluating PDE's in the form of algebraic equations. In the finite volume method, volume integrals in a partial differential equation that contain a divergence term are converted to surface integral using the divergence theorem. DIfference B/W FVM & FDM…

Objective & aim To derive 4th order approximation using taylor table method  of function exp(x)*cos(x) in 3 methods 1.Right skewed scheme 2.Left skewed scheme 3.Central differencing   Formulation of taylor table method for right skewed scheme `f''(x)=(af(x)+bf(x+h)+cf(x+2h)+df(x+3h)+ef(x+4h)+ff(x+5h))/h^2`…

 Objective; To stimulate the isentropic flow through a quasi id subsonic-supersonic nozzle by deriving both the conservative and non-conservative forms of the governing equations and solve them using MacCarmack technique by determining the steady-state temperature distribution for the flow field variable and investigate…

To write the code which solves the 2D heat conduction equation by using the iterative methods given below ; 1.Jacobi 2.Gauss Seidel 3.Successive over relaxation The above 3 equations can be solved in 2 ways 1.Implicit method 2.Explicit method The given boundary conditions and values are Top boundary = 600k Bottom boundary…