A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows

A parallel adaptive mesh refinement (AMR) algorithm is proposed and applied to the predictions of turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing turbulent compressible flows of reactive thermally perfect gaseous mixtures using a fully coupled finite-volume formulation on body-fitted multi-block quadrilateral meshes and hexahedral meshes. The compressible formulation adopted herein can readily accommodate large density variations and thermo-acoustic phenomena. A preconditioned multigrid algorithm is used to obtain the solution on highly stretched meshes in a more efficient manner. A flexible block-based hierarchical data structure is used to maintain the connectivity of the solution blocks in the multi-block mesh and to facilitate automatic solution-directed mesh adaptation according to physics-based refinement criteria. For calculations of near-wall turbulence, an automatic near-wall treatment readily accommodates situations during adaptive mesh refinement where the mesh resolution may not be sufficient for directly calculating near-wall turbulence using the low-Reynolds-number formulation. Numerical results for turbulent diffusion flames, including cold- and hot-flow predictions for a bluff-body burner, are described and compared to available experimental data. The numerical results demonstrate the validity and potential of the parallel AMR approach for predicting fine-scale features of complex turbulent non-premixed flames.

Department dc:contributor.department

Aerospace Science and Engineering

Year dc:date.issued

2008

Author dc:creator

• Gao, Xinfeng

Advisor dc:contributor.advisor

• Groth, Clinton

• Parallel Adaptive Mesh Refinement
• Turbulent Combusting Flows
• Turbulent Diffusion Flames
• Numerical Algorithm

Statement dc:rights

• Attribution-NonCommercial-NoDerivs 2.5 Canada

Licence dc:rights.uri

• http://creativecommons.org/licenses/by-nc-nd/2.5/ca/

Language dc:language.iso

en_ca

Handle dc:identifier.uri

http://hdl.handle.net/1807/94293

OAI identifier oai:identifier

oai:utoronto.scholaris.ca:1807/94293