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CFD Analysis Process
All that we do is not Rocket Science. But if you talk about Rocket Science, CFD is all what goes into it! Here are the steps any CFD Analysis and Simulation process needs to optimize the design.Formulate the Flow Problem
- easiest way
- geometry to be included
- operating conditions
- flow domain
- nature of the viscous flow
Model the Geometry and Flow Domain
- This generally involves modeling the geometry with a CAD software package. Approximations of the geometry and simplifications may be required to allow an analysis with reasonable effort.
Establish the Boundary Conditions
- Since a finite flow domain is specified, physical conditions are required on the boundaries of the flow domain. The simulation generally starts from an initial solution and uses an iterative method to reach a final flow field solution.
Generate the Grid
- The flow domain is discretized into a grid. The grid generation involves defining the structure and topology and then generating a grid on that topology.
Establish the Simulation Strategy
- The strategy for performing simulation involves determining such things as the use of space-marching or time-marching, the choice of turbulence or chemistry model, and the choice of algorithms.
Establish the Input Parameters and Files
- A CFD code generally requires that an input data file be created listing the values of the input parameters consisting of the desired strategy. Further, files for the grid and initial flow solution are generated.
- The simulation is performed with various possible with options for interactive or batch processing and distributed processing.
Monitor the Simulation for Completion
- As the simulation proceeds, the solution is monitored to determine if a converged solution has been obtained, which is called iterative convergence.
Post-Process the Simulation to get the Results
- Post-Processing involves extracting the desired flow properties (thrust, lift, drag) from the computed flow-field.
Compare the Results Repeat the Process to Examine Sensitivities
- The sensitivity of the computed results should be examined to understand the possible differences in the accuracy of results and/or performance of the computation with respect to all relevant physical parameters.
- Documenting involves describing each of these steps.
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