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32.3.21 Define/Dynamic Mesh/Parameters...

The Define/Dynamic Mesh/Parameters... menu item opens the Dynamic Mesh Parameters panel.



Dynamic Mesh Parameters Panel


The Dynamic Mesh Parameters panel allows you to define the all the parameters for modeling a dynamic mesh model. See Section  11.7.1 for details about using the items below.

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Controls

Model   contains options to enable the Dynamic Mesh, In-Cylinder, 2.5D, and Six DOF Solver models.

Dynamic Mesh   enables the dynamic mesh model and expands the panel to display the relevant parameters.

In-Cylinder   enables the in-cylinder model. See Section  11.7.1 for more information on FLUENT's in-cylinder model.

2.5D   enables the 2.5D model. This option will appear only for 3D cases. See Section  11.7.6 for more information on FLUENT's 2.5D model.

Six DOF Solver   enables six degrees of freedom solver. See Section  11.7.7 for more information on this model.

Mesh Methods   contains options to specify the mesh update method(s).

Smoothing   enables the spring-based smoothing method where the edges between any two mesh nodes are idealized as a network of interconnected springs. See Section  11.3.2 for details.

Layering   enables the dynamic layering method which can be used to add or remove layers of cells adjacent to a moving boundary based on the height of the layer adjacent to the moving surface in prismatic mesh zones. See Section  11.3.2 for details.

Remeshing   enables the local remeshing method in which the cells that violate the skewness or size criteria are agglomerated and locally remeshed. See Section  11.3.2 for details.

Smoothing   contains parameters to be specified for the smoothing mesh update method.

Spring Constant Factor   controls the spring stiffness.

Boundary Node Relaxation   specifies how the node positions on the deforming boundaries are updated. This applies only if your model contains deforming boundaries.

Convergence Tolerance   controls the smoothing convergence.

Number of Iterations   specifies the number of iterations.

Layering   contains parameters to be specified for the layering mesh update method.

Options   specifies the criteria for splitting or collapsing cell layers.

Constant Height   specifies that the cell layers are split or merged based on height.

Constant Ratio   specifies that the cell layers are split or merged based on ratios.

Split Factor   specifies the value of $\alpha_s$ in Equation  11.3-7. It controls the height or ratio at which the cells are split.

Collapse Factor   specifies the value of $\alpha_c$ in Equation  11.3-8. It controls the height or ratio at which the cells are collapsed and merged into the next layer.

Remeshing   contains parameters to be specified for the remeshing mesh update method.

Options   contains options which control the remeshing process.

Size Function   enables the marking of cells for remeshing based on the size distribution generated by the sizing function.

Must Improve Skewness   enables replacement of the agglomerated cells only if the quality of the remeshed cells has improved.

Face Remeshing   allows to remesh the deforming boundary face, if required. This option is available only for 3D cases.

Minimum Length Scale   specifies the lower limit of cell size below which the cells are marked for remeshing.

Maximum Length Scale   specifies the upper limit of cell size above which the cells are marked for remeshing.

Maximum Cell Skewness   specifies the desired maximum skewness for the mesh.

Maximum Face Skewness   specifies the desired maximum skewness for the surface mesh. This option is active, when Face Remeshing is selected under Options.

Size Remesh Interval   specifies the interval in time steps for remeshing based on the above size criteria only. Marking of cells based on skewness occurs automatically at every time step when Remeshing is enabled.

Size Function Resolution   sets the resolution for the sizing function. See Section  11.7.1 for more information. This item will appear only if Sizing Function is enabled.

Size Function Variation   specifies the value of $\alpha$ in Equation  11.3-14. This item will appear only if Sizing Function is enabled.

Size Function Rate   specifies the value of $\beta$ in Equation  11.3-15. This item will appear only if Sizing Function is enabled.

Mesh Scale Info...   opens the Mesh Scale Info panel, in which you can view the statistics of the mesh such as minimum and maximum length scale values and maximum cell and face skewness vales.

Use Defaults   resets the sizing function parameters to the default values. This item will appear only if Sizing Function is enabled.

In-Cylinder   contains parameters to be specified for the in-cylinder model.

Crank Shaft Speed   specifies the speed of the crank shaft.

Starting Crank Angle   specifies the starting crank angle.

Crank Period   specifies the crank period.

Crank Angle Step Size   specifies the crank angle step size used to determine the time step size to advance the solution.

Piston Stroke   specifies the piston stroke to calculate the piston location.

Connecting Rod Length   specifies the length of the connecting rod.

Piston Stroke Cutoff   specifies the piston stroke cutoff used to control the onset of layering in the cylinder chamber.

Minimum Valve Lift   specifies the minimum valve lift.

Six DOF Solver   contains parameters to be specified for the Six DOF Solver.
Gravitational Acceleration   contains the text entry boxes for gravitational acceleration in x, Y, and Z directions.
X, Y, Z   specifies the gravitational acceleration in X, Y, and Z directions respectively.



Mesh Scale Info Panel


The Mesh Scale Info panel allows you to inspect the values of minimum and maximum length scale and maximum cell/face skewness in a mesh.

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Controls

Minimum Length Scale   displays the lower limit of cell size below which the cells are marked for remeshing..

Maximum Length Scale   displays the upper limit of cell size below which the cells are marked for remeshing.

Maximum Cell Skewness   displays the maximum cell skewness in the zone.

Maximum Face Skewness   displays the maximum cell skewness in the surface mesh.


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