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Advanced Meshing Topics

The meshes you create has a tremendous impact on the solution of your numerical model, both with respect to its accuracy and to the computing resources it demands. To get the best possible solution while maintaining computing needs to the minimum required, Argus MeshMaker modules are designed to comply with the following three discretization rules:

The Argus MeshMaker® modules allow you to fully control your mesh shape and size using the intuitive concept of the Mesh Density. The mesh density can be set to any domain outline object (i.e. outline, line feature (river/fault) and point source/sink (i.e. well), and to other zone definition in a density layer that is automatically linked to the mesh layers. In addition, it also takes into consideration many other factors to insure your mesh is valid for a numerical solution.

Argus MeshMaker's auto mesh generation engines analyze the domain outline structure, any internal discontinuities, the mesh density you assign to different domain outline contours and mesh densities you assign to density contours. It then meshes the domain to satisfy your requirements while adhering to the above three prerequisites.

Standard Auto-Mesh-Generation

Setting the mesh density to a domain outline is done by specifying the length of an element side. This sets the maximum element side AMG will create.

Basic Mesh
* Click on any image in this page to see it in full size

Element Density Control

Assigning different mesh density to contours you create in the density layer allow you to set the exact element size within a zone. The mesh on the left was refined by setting the density value of the red contour to value lower than that of the domain outline contour.
Basic Mesh Setting Element Density

The Effect of a Small Domain Outline Segment

Any contour segment that is smaller than the density specified in the area it is located reduces the mesh density that will be applied. This way the mesh is kept free of acute elements. The domain outline on the right has one small segment at its top right corner. As a result element size is reduced and only gradually grows out to the general density value assigned to the domain.
Basic Mesh Effect of Small Segments

The Effect of Near Domain Outline Objects - Islands Case

When domain features are closer to each other than the density applied in the area they are located, the density is reduced. This automatically protect you form having elements where two of their opposite nodes lie on domain boundaries (creating a discontinuity). The domain outline on the right was added two internal discontinuities closer to each other than the general density applied to the domain outline. As a result, element size was automatically reduced.
Basic Mesh Effect of Close Islands

The Effect of Near Domain Outline Objects - Point Object Case

Point objects representing point source/sinks placed in the domain outline force mesh nodes. If placed closer to other point object, or to any other domain features, than the local density, AMG automatically reduces the density.
Basic Mesh Effect of Close Wells

A Point Object can also Set Element Density

Point objects as well as any other domain feature can be assigned a density.
Basic Mesh Setting Element Density

The Combined Effect of Multiple Domain Outline Objects

You can place any number and type of domain features in a domain layer and Argus MeshMaker will automatically generate a perfect mesh. Internal discontinuities will be left unmeshed, line features will be meshed such that element sides do not cross them and point objects will force nodes above them. Argus MeshMaker modules enable you to only specify the conceptual physical problem at hand and they will automatically produce the correct mesh. If you need to re-mesh the domain, all relevant information is kept in other layers, so that your mesh can be regenerated in second or minutes.
Basic Mesh Mesh with Island, River and Well

Slow vs. Fast Growth of Element Size

You can control all of the above capabilities, as well as element growth rate, by setting them in the Preferences dialog. The mesh on the left was created by setting element growth rate to minimum, while the one on the right was created by setting element growth rate to maximum.
Mesh with Slow Element Growth Mesh with Fast Element Growth

Controlling Mesh Effecting Preferences

Argus MeshMaker modules allow you full control over every aspect of the automatic mesh generation. You can turn on and off any automatic interpretation performed by the AMG and change every default setting. The following screen-shot presents the mesh preferences control panel.

Preferences Dialog Box

New (PIE) Meshing Engines Available free of charge

New Argus MeshMaker modules developed using the Argus ONE PIE technology are offered free fo charge. The two new MeshMaker modules are for creating orthogonal quadrilateral meshes.

A Cartesian Orthogonal Quadrilateral Mesh can be easily created by converting a F.D. grid to a Quad mesh:
Create a grid in Grid layer, the grid can have variable block size or can be rotated, then activate a Quad Mesh
Layer and from the Edit menu select Read Mesh from Grid. Select the Grid Layer from which you want to
copy the Grid.

An Orthogonal Quadrilateral Mesh can be easily created using the SuperBlocks PIE.

Creating a mesh from a set of X,Y points located in Data type layers.

Points in a data layer from which a mesh is to be created
The created mesh with the originating points

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