Week 8 - Simulation of a backward facing step in OpenFOAM

 AIM: To simulate auto-ignition time and molar concentration of the elements for methane using the reactor network code.    OBJECTIVE: To plot the variation of Auto Ignition time of Methane with a constant temperature of 1250K and pressure varying from 1 to 5 atm. To plot the variation of Auto Ignition time…

AIM: Solving the below set of non-linear equations by using multivariate Newton-Raphson solver.  `dy_1/dt=-0.04y_1+10^4*y_2*y_3`........................................(1) `dy_2/dt=0.04y_1-10^4y_2*y_3-3*10^7*y_2^2`....................(2` `dy_3/dt=3*10^7*y_2^2`...........................................................(3)…

AIM: Literature review on stability of ordinary differential equation   OBJECTIVE: When does a ODE become unstable? How does stability affect engineering simulations? Can stability condition be derived for all types of problems?     import numpy as np import matplotlib.pyplot as plt total_t=0.001 dt=9e-4…

AIM: To derive the reaction rate ODEs and production of each species for the simple mechanism given below.     Reactions: 1.  `CO+O_2=CO_2+O`........R1                   2.  `O+H_2O=OH+OH`.........R2           …

AIM: To find out the combustion efficiency and adiabatic flame temperature when a recuperator is connected to a furnace for recovering         some energy( methane and air is burned in the furnace). OBJECTIVE: Effect of preheating on the adiabatic flame temperature. How the combustion…

  AIM: To work with the Quantity class of Cantera to create various mixtures and also to explain how the mixture calculations are         performed.    As we know stoichiometry combustion reaction between methane and air is given by: `CH4+2*(O2+3.76N2)=CO2+2H2O+7.52N2`…

AIM: Adiabatic flame temperature calculation by varying the equivalence ratio,heat loss,number of carbon atoms and also with respect to alkane,alkene and alkyne.   OBJECTIVE: 1.By variation of equivalence ratio:   Assuming that methane is contained in a constant volume chamber. We need to write a program in Python…

AIM: Simulaton of PFI engine using CONVERGE.   OBJECTIVE: 1. To find out the compression ratio of this engine from input data provided. 2. Why do we need a wall heat transfer model? Why can't we predict the wall temperature from the CFD simulation? 3. To find out the combustion efficiency of this engine 4. To determine…

  AIM: Emission characterization on a CAT3410 engine.   OBJECTIVE: To create cut-plan animations showing Soot, Nox and UHC and compare them between the omega and the open-w pistons. To compare the imep and power values graphically.     INTRODUCTION   With respect to the mathematical modelling of…

AIM:  Surface preparation and boundary flagging of port fuel injection engine.   OBJECTIVE: Bondary flagging  surface preparation             INRODUCTION: PFI system replaced carburetter in cars because of their efficiency and lower maintenance requirements.…

AIM: Literature study on RANS derivation and analysis for Reynolds stress.   OBJECTIVE: Discuss on the term Reynolds stress. Discuss on turbulent viscosity and how is it different from molecular viscosity.     RANS MODELLING: The RANS approach decomposes flow variables (e.g. velocity) into mean and fluctuating…

 AIM: To simulate a transient shock tube using CONVERGE CFD.   OBJECTIVE: To plot the pressure and temperature history in the entire domain. To plot cell count as a function of time.   INTRODUCTION:    Shock tubes are ideal devices for studying combustion and chemical kinetics at high temperature…

AIM: Conjugate heat transfer simulation using CONVERGE  in a pipe flow.   OBJECTIVE:  To run grid dependence test on 3 grid size. effect of supercycle stage interval i,e, 0.01,0.02,and 0.03. To show temperature converges to a particular value.     INTRODUCTION:    As we know 3D Transient…

AIM: Simulating Prandtl Meyer shock problem using converge CFD.   OBJECTIVE:        To study shock flow boundary condition        To study physics behind shock waves.        Effect of sub-grid scale parameter on shock location.…

AIM: To set up a transient flow over a throttle body   OBJECTIVE: To show pressure and velocity contour bby post processing the results. To show plots for pressure,velocity,mass flow rate and total cell count. To create an animation for throttle movement.   INTRODUCTION: In this set up , we need to study transient…

AIM: Steady state simulation for flow over throttle body using converge cfd.   OBJECTIVE: To show pressure and velocity contours after post processing the results. To show the plots for pressure and velocity contours. Showing mesh with surface edges. To create an animation in which throttle is visible    …

AIM: To simulate flow over a backward facing step in converge. OBJECTIVE:To run the simulation for three different mesh size as 2mm,1.5mm and 1mm respectively.To show the plots of velocity,pressure,mass flow rate and Total cell count for all mesh size.To show velocity and pressure contours. INTRODUCTION: Backward…

 AIM: Simulating channel flow using Converge CFD.   OBJECTIVE: To show velocity and pressure contours for all three base mesh sizes. To show plots for velocity,pressure,mass flow rate and total cell count for all three base mesh sizes.    INTRODUCTION  It is a type of liquid flow within a conduit…

 AIM:To perform a non-premixed combustion simulation of natural gas on a combustor model.    OBJECTIVE: To plot the variation of the mass fraction of the different species in the simulation using line probe at different location.    INTRODUCTION: Simulation of combustion is based on mixing of air…

AIM: To perform analysis on cyclone separator and calculate the separation efficiency and pressure drop with discrete phase         modelling.   OBJECTIVE   To write a few words about any four empirical models used to calculate the cyclone separator efficiency. To perform an…

AIM: To perform a parametric study on the gate valve simulation by setting the opening from 10% to 80%.   OBJECTIVE: To obtain the mass flow rates at the outlet for each design point. Calculating the flow coefficient and flow factor for each opening and plot the graph. Discuss the results of the mass flow rate and…

  AIM: To perform a steady state conjagate heat transfer anaysis on a model of a graphics card by choosing appropriate material of choice          for simulation.      OBJECTIVE : Running the simulation by varying the velocity from 1m/sec to 5m/sec for at least…

Aim:  To perform Rayleigh Taylor instability simulation for different mesh sizes.         OBJECTIVE     To  Perform the Rayleigh Taylor instability simulation for 2 different mesh sizes with the base mesh being 0.5 mm.   To compare the results by showing the animations(…

AIM: Conjugate heat transfer analysis on exhaust port .   Objectives:   Brief description of why and where a CHT analysis is used. Maintainning the y+ value according to the turbulence model and justify the results.  Calculate the wall/surface heat transfer coefficient on the internal solid surface &…

AIM: To simulate the external flow simulations over an Ahmed body.   OBJECTIVE  To describe Ahmed's body and its importance.  To explain the reason for the negative pressure in the wake region.   To explain the significance of the point of separation.   Expected Results:  Velocity and…

                                                        …

AIM: To set up steady-state simulations to compare the mixing effectiveness when hot fluid inlet temperature is 360C & the Cold fluid inlet              is at 190C that flows in a mixing tee.   Case 1  Short mixing tee with a hot inlet velocity of…

 AIM: To simulate laminar flow through pipe having constant cross-section using symmetry boundary condition by taking the wedge angle          as 10deg,25deg and 45deg and also comparing it with wedge boundary condition.           …

AIM: To simulate an axi-symmetric laminar flow through a constant cross section pipe by applying the wedge boundary condition at an inlet Reynolds number of 2100 and also validate the results with the hagen-poiseulle's equation for the fully developed flow.                     …

FINITE VOLUME METHOD: It is a method for representing and evaluating PDE in the form of algebraic equations. In finite volume method ,volume integrals in a PDE that contain a divergence term are converted to surface integrals using the divergence theorem.Divergence represents volume density of the outward flux of a vector…

Aim: To simulate an incompressible-laminar-viscous flow through the backward facing step geometry using transient simulation.   desired output : Measure the velocity profile at 0.085 m from the inlet of the geometry for both case studies and compare. You can use the plot over line tool for this. Explain why Grading/Growth…

AIM:Simulation of 1-D super sonic nozzle flow using Maccormack method   OBJECTIVE   Need to show the following plots inside the report1. Steady-state distribution of primitive variables inside the nozzle.2. Time-wise variation of the primitive variables.3. Variation of Mass flow rate distribution inside the nozzle…

AIM: Solving the steady state 2-D heat conduction equation using point iterative techniques . GIVEN: 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 we will implement the following methods for solving implicit equations :…

AIM:  To derive the following 4th order approximations of the second-order derivative. 1. Central difference 2. Skewed right-sided difference 3. Skewed left-sided difference objective: To write a program in matlab to evaluate the second order derivative of the analytic function exp(x)*cos(x) and comparing it with…