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本帖最后由 wdhd 于 2016-4-1 10:07 编辑
Specialized Modules
A continually growing collection of specialized FEMLAB modules provide a comfortable working environment for modeling in a specific application area. The modules use standardized terminology, material libraries, specialized solvers and elements as well as appropriate visualization tools. At the same time, they are fully integrated with FEMLAB and each other. Each comes with a separate manual and model library, which provide solutions to a variety of field-specific prob-lems.
For FEMLAB 3.0, the currently available modules are:
o The Chemical Engineering Module-transport phenomena and chemical reactions in reactors and unit operations; heat transfer,mo-mentum transfer, and mass-transfer analysis
o The Electromagnetics Module-wave propagation and mode analysis in microwave engi-neering and photonics, static and quasistatic electromagnetic field simulations
o The Structural Mechanics Module-static, quasistatic, dynamic, eigenfrequency, para-metric and frequency-response analyses; beam, plate, shell and solid elements.
FEMLAB in Research
The ability to define and couple any number of nonlinear PDEs makes FEMLAB a unique tool for sophisticated modeling of cutting-edge applications. This flexibility and equation-based approach help FEMLAB users advance their research in MEMS, nanotechnology, fuel cells, photonics, biomedical engineering and many other areas.
FEMLAB in Design and Development
FEMLAB provides a fast, smooth modeling process perfectly suited for design and develop-ment. With its Java-based interface you can per-form modeling in minutes and quickly vary pa-
rameters to optimize the design. The program's open structure and integration with MATLAB form a complete environment for system simulation and analysis.
FEMLAB in Education
FEMLAB models simulate and visualize applications from all fields of physics and engineering, and with its equation-based modeling approach educators can freely explore PDEs to any depth of detail. The package's flexibility and ease of use make it an efficient tool in education; using one software package minimizes the time spent learn-ing the modeling procedures for both teachers and students. Instead, they can focus on the applications and the results.
USING FEMLAB
With FEMLAB's interactive modeling environment you can build and analyze models from start to finish without the need to involve any other software packages; FEMLAB integrates tools that allow you to work efficiently at each step in the process, all within one consistent and easy-to-use graphical environment. It's easy to move back and forth between various stages such as setting up the geometry, defining the physics, creating a mesh, solving the model and doing postprocessing. The package's associative geometry feature preserves any boundary conditions and equations even if you change the geometry.
The modeling procedure typically involves the following steps:
1. Model the Geometry
FEMLAB provides powerful CAD tools for creating 1D, 2D and 3D geometric objects using solid modeling. Work planes are useful for creating 2D profiles that you rotate, extrude and embed into 3D structures. You can also create geometry models directly with primi-tives such as circles, rectangles, blocks and spheres, and then use Boolean operations to form composite solid models.
You can also base FEMLAB models on geometric models created in other software packages. Its geometry import and repair function supports the IGES file format in 3D, and the DXF file format in 2D. It's also possible to import 2D images in JPG, TIF and BMP formats and convert them into FEMLAB geometry objects, and in 3D you can do the same even with 3D MRI (magnetic resonance imaging) data. 1D, 2D, and 3D geometries can be mixed in the same model too. We call that Extended Multiphysics.
2. Define the Physics
Although it is possible to create a model entirely from scratch using the built-in CAD tool and by entering all the appropriate equations, FEMLAB makes this work much easier. You can instead define a model's phys-ical properties by using a variety of prede-fined application modes. Examples include viscosity and density in the Navier-Stokes equations, or conductivity and permittivity in electromagnetics. The properties can be isotropic or anisotropic; they can be functions of the modeled variables, the spatial coordinates and time.
Consider the propagation of microwaves in a dielectric medium. The microwaves gener-ate heat, which in turn influences the physical properties of the medium. The wave-propagation problem is highly dependent on the heat transport problem and vice versa. The expressions for the physical properties depend on the material. In FEMLAB, you simply type them in as analytical functions of the modeled variables; just select from application-specific boundary and interface conditions to define the model.
3. Generate the Finite-Element Mesh
FEMLAB's mesh generators create triangular or tetrahedral unstructured meshes. Adaptive meshing automatically refines the mesh wherever needed to improve accuracy. In addition, you can control the mesh generator to resolve the geometry for successful analyses, for instance, by setting a maximum element length along a boundary
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发表于 2005-6-25 08:42
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发表于 2005-6-25 11:42
