Applications of Local Adaptive Mesh Refinement Scheme for Engine Spray Simulations

The accurate prediction of fuel sprays is critical to engine combustion and emissions simulations. A fine computational mesh is often required to better resolve fuel spray dynamics and vaporization. However, computations with a fine mesh require extensive computer time. This study developed a methodology that uses a locally refined mesh in the spray region. Such adaptive mesh refinement will enable greater resolution of the liquid-gas interaction while incurring only a small increase in the total number of computational cells. The present study uses an h-refinement adaptive method. A face-based approach is used for the inter-level boundary conditions. The refinement criterion is based on the mass of spray liquid and fuel vapor in each cell. The efficiency and accuracy of the present adaptive mesh refinement scheme is demonstrated. Results show that the present scheme will achieve similar accuracy in spray modeling as compared to a uniformly fine grid with significantly lower computational cost.

[1]  Mario F. Trujillo,et al.  KIVA-4: An unstructured ALE code for compressible gas flow with sprays , 2006, J. Comput. Phys..

[2]  Simone E. Hieber,et al.  AN INVESTIGATION OF THE MESH DEPENDENCE OF THE STOCHASTIC DISCRETE DROPLET MODEL APPLIED TO DENSE LIQUID SPRAYS , 2001 .

[3]  Dimitri J. Mavriplis,et al.  Adaptive Meshing Techniques for Viscous Flow Calculations on Mixed Element Unstructured Meshes , 1997 .

[4]  R. Anderson,et al.  An arbitrary Lagrangian-Eulerian method with adaptive mesh refinement for the solution of the Euler equations , 2004 .

[5]  Y. Kallinderis,et al.  Adaptation methods for a new Navier-Stokes algorithm , 1989 .

[6]  李幼升,et al.  Ph , 1989 .

[7]  Yeng-Yung Tsui,et al.  A Pressure-Correction Method for Incompressible Flows Using Unstructured Meshes , 2006 .

[8]  A. A. Amsden,et al.  KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves , 1997 .

[9]  Terutoshi Tomoda,et al.  Numerical Study of Mixture Formation and Combustion Processes in a Direct Injection Gasoline Engine with Fan-Shaped Spray , 2001 .

[10]  Daniel C. Haworth,et al.  Adaptive grid refinement using cell-level and global imbalances , 1997 .

[11]  John Abraham,et al.  WHAT IS ADEQUATE RESOLUTION IN THE NUMERICAL COMPUTATIONS OF TRANSIENT JETS , 1997 .

[12]  David P. Schmidt,et al.  Improving the Numerical Accuracy of Spray Simulations , 2002 .

[13]  Thierry Baritaud,et al.  Extension of Lagrangian-Eulerian Spray Modeling: Application to High Pressure Evaporating Diesel Sprays , 2000 .

[14]  S. Muzaferija,et al.  Finite-Volume CFD Procedure and Adaptive Error Control Strategy for Grids of Arbitrary Topology , 1997 .

[15]  Z Pirzadeh Shahyar.  An Adaptive Unstructured Grid Method by Grid Subdivision, Local Remeshing, and Grid Movement , 1999 .

[16]  O. Colin,et al.  Improved Modelling of DI Diesel Engines Using Sub-grid Descriptions of Spray and Combustion , 2003 .

[17]  R. Reitz,et al.  Reduction of Numerical Parameter Dependencies in Diesel Spray Models , 2007 .

[18]  Michel Visonneau,et al.  Adaptive finite-volume solution of complex turbulent flows , 2007 .

[19]  David P. Schmidt,et al.  Mesh Independence and Adaptive Mesh Refinement For Advanced Engine Spray Simulations , 2005 .

[20]  M. J. Aftosmis,et al.  Upwind method for simulation of viscous flow on adaptively refined meshes , 1994 .

[21]  Rolf D. Reitz,et al.  Reduction of Numerical Parameter Dependencies in Diesel Spray Models , 2007 .

[22]  John Abraham,et al.  How far does the liquid penetrate in a Diesel engine : Computed results vs. measurements? , 1998 .