Application Note: FORTÉ Simulation Package                                             Automatic Mesh Generation with FORT...
Automatic Mesh Generation with FORTÉ         geometry, the FORTÉ simulator will display the geometry as shown in Figure 1....
Automatic Mesh Generation with FORTÉ         Once the global mesh sizes are set, you can optionally specify local mesh ref...
Automatic Mesh Generation with FORTÉ         Figure 3: Setting the mesh size on the piston face and around the valves     ...
Automatic Mesh Generation with FORTÉSummary         In this application note, we used the automatic mesh generation featur...
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Automatic Mesh Generation with Reaction Design FORTÉ

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Mesh generation for engine simulation is difficult and represents a significant bottleneck in the design flow. The typical engine CFD design project begins with a lengthy process to construct an adequate computational mesh of the engine geometry, which may include valves, spark plugs, ports, etc. The generated mesh must account for the fact that it must compress and stretch during the full engine cycle. The process of mesh creation can take up to weeks for a single design, making a design-of experiments that considers multiple geometries particularly challenging.

The FORTÉ mesh generator is fully automated and created a Cartesian mesh to assure that all boundary conditions are accurately enforced at the real physical boundaries. The automatic mesh generation capability works from the inside-out, removing issues that might occur when the CAD (e.g., STL) file contains small holes or discontinuities and eliminates the requirement for the imported surface-mesh files to be “water tight.” In addition, mesh refinement around exceptional features (like valves, etc) is accomplished automatically, with user control of the desired mesh size. Read more in this Application Note.

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Automatic Mesh Generation with Reaction Design FORTÉ

  1. 1. Application Note: FORTÉ Simulation Package Automatic Mesh Generation with FORTÉ FORTÉ-APP-Automesh (v1.0) April 4, 2011Overview This application note provides a description of how to use the automatic mesh generation capabilities with the FORTÉ Simulation Package. The automatic mesh generation begins by importing the engine geometry, typically from a CAD program in the form of an STL file. The user then performs any splitting or merging of surfaces to separate specific engine components, e.g. head, valves, piston, in the FORTÉ Simulator. The mesh generated is based on the global minimum cell size specified by the user. Optionally, the user can locally refine the mesh around important features, e.g. valves, piston, etc. The mesh is automatically created at every crank angle during the simulation. Prior to running the simulation, a preview of the mesh can be generated at different points during the cycle, i.e. different crank angles, to determine the quality of the mesh is at different locations.Automatic Mesh Generation Overview Mesh generation for engine simulation is difficult and represents a significant bottleneck in the design flow. The typical engine CFD design project begins with a lengthy process to construct an adequate computational mesh of the engine geometry, which may include valves, spark plugs, ports, etc. The generated mesh must account for the fact that it must compress and stretch during the full engine cycle. The process of mesh creation can take up to weeks for a single design, making a design-of- experiments that considers multiple geometries particularly challenging. The FORTÉ mesh generator is fully automated and created a Cartesian mesh to assure that all boundary conditions are accurately enforced at the real physical boundaries. The automatic mesh generation capability works from the inside-out, removing issues that might occur when the CAD (e.g., STL) file contains small holes or discontinuities and eliminates the requirement for the imported surface-mesh files to be “water tight.” In addition, mesh refinement around exceptional features (like valves, etc) is accomplished automatically, with user control of the desired mesh size.FORTÉ Automatic Mesh Generation Set Up The first step in generating a mesh is to import the engine geometry, typically from a CAD STL file. The FORTÉ package can also read-in geometry in CGNS and KIVA-3V file formats. After importing the©Reaction Design. All rights reserved. All Reaction Design trademarks, patents, and disclaimers are listed at www.reactiondesign.com. All other trademarks and registered trademarks are the property of their respective owners. All specifications are subject to change without notice.FORTÉ-APP-Automesh (v1.0) April 4, 2011 www.reactiondesign.com 1 1-858-550-1920
  2. 2. Automatic Mesh Generation with FORTÉ geometry, the FORTÉ simulator will display the geometry as shown in Figure 1. In this screen, the geometry features are listed in the visualization section on the right side of the window. You can turn on and off geometric surfaces as needed. The work tree is listed on the upper left portion of the screen and shows all of the geometry elements. You have the ability to split the geometry and remove areas that are not of interest. You can also merge geometry elements. Figure 1: FORTEs automatic mesh generation screen layout Setting Mesh Sizes Once you have completed any splitting or merging of elements, you are ready to set the global mesh size through the Mesh Controls work tree element, as shown in Figure 2.FORTÉ-APP-Automesh (v1.0) April 4, 2011 www.reactiondesign.com 2 1-858-550-1920
  3. 3. Automatic Mesh Generation with FORTÉ Once the global mesh sizes are set, you can optionally specify local mesh refinement for the piston head and around the valves. You do this by selecting the elements that are associated with the piston face and valves as show in Figure 3. Figure 2: Setting the global mesh size in FORTÉ Now, you are ready to begin your simulation. No other set up is required. The FORTÉ simulator will automatically build the mesh at each crank angle during the solution process. You can get a preview of the mesh construction by selecting Preview Mesh and specifying a cut plane where you enter the location of the plane and the crank angle you would like to see, as shown in Figure 4. By creating a preview of the mesh, it provides feedback on how the mesh will look during the actual simulation.FORTÉ-APP-Automesh (v1.0) April 4, 2011 www.reactiondesign.com 3 1-858-550-1920
  4. 4. Automatic Mesh Generation with FORTÉ Figure 3: Setting the mesh size on the piston face and around the valves Figure 4: Preview the mesh to see detail around the valves and the pistonFORTÉ-APP-Automesh (v1.0) April 4, 2011 www.reactiondesign.com 4 1-858-550-1920
  5. 5. Automatic Mesh Generation with FORTÉSummary In this application note, we used the automatic mesh generation feature in the FORTÉ Simulation Package to automatically create a Cartesian mesh for the full cylinder with moving valves. An STL CAD file is imported and geometry features that are not relevant are split from the domain. Once the mesh sizes have been input, the FORTÉ package automatically creates the mesh during the CFD simulation. It is also possible to preview the mesh to verify that the treatment around valves and the piston are appropriate. The FORTÉ automatic mesh generation feature in is an important advancement that significantly reduces the overall time-to-solution for combustion CFD analysis of internal combustion engines.About Reaction Design Reaction Design helps transportation manufacturers and energy companies rapidly achieve their Clean Technology goals by automating the analysis of chemical processes via simulation and modeling solutions. Reaction Design is the exclusive developer and distributor of CHEMKIN, the de facto standard for modeling gas-phase and surface chemistry, providing engineers ultra-fast access to reliable answers that save time and money in the development process. Reaction Design’s ENERGICO product brings accurate chemistry simulation to combustion systems using automated reactor network analysis. Reaction Design also offers the CHEMKIN-CFD software module, which brings detailed kinetics modeling to other engineering applications, such as Computational Fluid Dynamics (CFD) programs. Reaction Design’s world-class engineers, chemists and programmers have expertise that spans multi-scale engineering from the molecule to the production plant. Reaction Design serves more than 350 customers in the commercial, government and academic markets. Reaction Design can be found online at www.reactiondesign.com.CHEMKIN® and Reaction Design® are registered trademarks of Reaction Design. CHEMKIN-PRO,ENERGICO, and CHEMKIN-CFD are trademarks of Reaction Design.FORTÉ-APP-Automesh (v1.0) April 4, 2011 www.reactiondesign.com 5 1-858-550-1920

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