University of Twente Student Theses


Flamelet Generated Manifold in ANSYS Fluent and ANSYS Workbench CFD Automation and Optimization

Käser, R.H. (2015) Flamelet Generated Manifold in ANSYS Fluent and ANSYS Workbench CFD Automation and Optimization.

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Abstract:The internship in the gas combustion technology sector at Siemens AG (Berlin, Germany) had two main goals. First, the use of the Flamelet Generated Manifold (FGM) in ANSYS Fluent was tested for combustion simulation. Secondly, the possibilities of using ANSYS Workbench for CFD workflow automation and optimization were discovered. The FGM method is a promising method to simplify flame calculations. The idea is that a multi-dimensional flame can be considered as an ensemble of one-dimensional flames, the so-called flamelets. These flamelets are used to construct a low-dimensional manifold in composition space with a corresponding database in which the thermo-chemical variables are stored. This database can be consulted by a CFD-Solver, e.g. ANSYS Fluent or ANSYS CFX, and reduces the equations to be solved. The FGM method has already been applied to CFX simulations of the 4000F gas burner at Siemens. However, the application of the method combined with Fluent was not investigated yet. Therefore, Fluent has beed used to simulate the same 4000F burner and to compare the results with the CFX simulations. As a result advice was given to Siemens about the use of FGM in combination with different turbulence and turbulence-chemistry interaction models for future combustion simulations. Ansys Workbench has been used to automate and optimize fuel-air mixing simulations for the 4000F burner. The user-time needed for such a simulation, i.e. changing the geometry, creating a mesh, updating the CFX setup, running the simulation and post processing, was more than four hours. This user-time was reduced to less than one hour by creating the workflow in Workbench. The new approach was tested for multiple fuel-air mixing studies with small changes in e.g. composition, geometry and/or temperature and proved to be accurate. In the end the optimization options in Workbench were tested and an optimal geometry was found, which resulted in the lowest unmixedness of fuel and air. Siemens was given advice for further use of Workbench as an automation and optimization tool in future CFD studies.
Item Type:Internship Report (Master)
Siemens AG, Germany
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:ANSYS CFX, ANSYS Fluent, ANSYS Workbench, CFD, FGM, Fuel-Air Mixing, Gas Combustion, Siemens, Turbulence, Workbench Automation, Workbench Optimization
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