Week 3 - External flow simulation over an Ahmed body.

Objective To simulate the isentropic flow through a quasi 1D subsonic - supersonic nzzle for both conservative and non - conservative forms of goverrning equations using MacCormack's technique. Theory Consider a steady state isentropic flow through a convergent-divergent nozzle as shown in below figure.   The inlet…

Objective : 1. 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…

AIM To derive the fourth order approxiamtion of second order derivative using central difference, skewed right side difference and skewed left side difference.   Central difference method The order of accuracy P = Number of nodes in the stencil N - order of derivative Q + 1 P=N-Q+1 N=P+Q-1=4+2-1=5 We have 5 point in the…

AIM To perform steady state conjugate heat transfer analysis on the model graphics card. Run the simulation by varying the inlet velocity from 1  m/s to 5  m/s. Find out maximum temperature and heat transfer coefficient attained by processor Identify hot spots in the model. CHT Analysis The conjugate heat transfer…

imeAIM To perform Rayleigh Taylor instability simulation and explain the results. Rayleigh Taylor Instability The Rayleigh–Taylor instability, or RT instability, is an instability of an interface between two fluids of different densities which occurs when the lighter fluid is pushing the heavier fluid. Examples…

AIM To do the conjugate heat transfer simulation of an exhaust port and calculate the heat transfer coefficient. Show velocity and temperature contours and validate the result. CHT Analysis The conjugate heat transfer analysis helps to do the simulation of heat transfer between solid and fluid domains by exchanging exchanging…

AIM To perform external flow simulation over Ahmed body and calculate the coefficient of drag for an inlet velocity of 25 m/s. Plot velocity and pressure contours. Perform grid independency test and it's effect on drag coefficient. Q1: Describe Ahmed's body and it's importance.  Ahmed Body is a generic car body that…

AIM Simulate the flow with the steady and unsteady case and calculate the Strouhal Number for Re= 100. Calculate the coefficient of drag and lift over a cylinder by setting the Reynolds number to 10,100,1000,10000 & 100000 with steady state solver and discuss the effect of Reynolds number on coefficeint of drag Plot…

AIM To do steady state simulation of mixing of two fluids in a mixing tee with 36 degree celsius and and 19 degree celsius as the inlet temperatures. To find out the mixing effectiveness in two cases, a short mixing tee and a long mixing tee. Use K-epsilon and k-omega model for the simulations and find out which model…

AIM To perform surface cleanup of the given model. Assing appropriate PIDs to all the parts of the model. Do surface meshing of the model with suitable target length and zero off elements. Do volumetric meshing of the model inisde a wind tunnnel. PROCEDURE Import the file into the ANSA software using File>Open>file…

Aim To do geometrical clean up of the three models. To merge the 3 models. To do surface wrap of the merged model with a target length of 3 mm. Procedure Import the geometry into the ANSA software using file>open>file location. Once the file is being imported, we have to perform geometrical clean up of the file before…

AIM To Clear all the geometrical errors of the given model. Do surface meshing of the model with the respective quality criteria and taget length. To ensure there is zero off elements in the surface meshing. Create a wind tunnel for CFD analysis of the model. Procedure Import the geometry file into ANSA software by File>Open>file…

Aim To perform geometrical checks on the given model and do the necessary surface clean up. Assign appropriate PID to the parts and do surface meshing with the given mesh length for each components. Do volumetric meshing in the necessary volumes obtained. Procedure Import the geometry file into the ANSA software by file>Open>…

AIM To clean up the given geometry of the pressure valve and mesh the geometry using 3 different mesh length with tria as the mesh element. Procedure To work on the geometry, import the file into the ANSA software by clicking file>open>choosing the location where the geometry is saved. Once the geometry is imported,…