05-06-2013, 12:54 PM
BASICS OF COMPUTATIONAL FLUID DYNAMICS ANALYSIS
BASICS OF COMPUTATIONAL.ppt (Size: 2.03 MB / Downloads: 209)
Introduction
What is CFD?
Prediction fluid flow with the complications of simultaneous flow of heat, mass transfer, phase change, chemical reaction, etc using computers
History of CFD
Since 1940s analytical solution to most fluid dynamics problems was available for idealized solutions. Methods for solution of ODEs or PDEs were conceived only on paper due to absence of personal computer.
Daimler Chrysler was the first company to use CFD in Automotive sector.
Speedo was the first swimwear company to use CFD.
There are number of companies and software's in CFD field in the world. Some software's by American companies are FLUENT, TIDAL, C-MOLD, GASP, FLOTRAN, SPLASH, Tetrex, ViGPLOT, VGRID, etc.
Initial or Boundary Conditions
Initial condition involves knowing the state of pressure (p) and initial velocity (u) at all points in the flow.
Boundary conditions such as walls, inlets and outlets largely specify what the solution will be.
Conclusion
Nearer the conditions of the experiment to those which concern the user, more closely the predictions agree with those data, the greater is the reliance which can be prudently placed on the predictions.
CFD iterative Methods like Jacobi and Gauss-Seidel Method are used because the cost of direct methods is too high and discretization error is larger than the accuracy of the computer arithmetic.
Many software’s offer the possibility of solving fully nonlinear coupled equations in a production environment.
In the future we can have a multidisciplinary, database linked framework accessed from anywhere on demand simulations with unprecedented detail and realism carried out in fast succession so that designers and engineers anywhere in the world can discuss and analyze new ideas and first principles driven virtual reality