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They are used to modify the configuration of their respective parent feature. View screenshot Refactoring of Functionalities into Subnodesįor a better user experience, a number of feature subnodes have been added to the heat transfer interfaces. You can see this functionality used in the Radiative Cooling of a Glass Plate model. In addition, several new quadrature options are available, and you can control the number of discrete ordinates, from 8 to 512, thus enabling detailed control of the trade-off between accuracy and computation speed. The scattering characteristics are defined by the so-called Henyey-Greenstein phase function. A new option is available to control the nature of radiation scattering in semitransparent materials. Important improvements have been made to the Radiation in Participating Media interface. This multiphysics model of a heating circuit is defined using the new capabilities for thin, layered materials with a combination of heat transfer, electric currents, and structural membrane physics.Įxtended Capabilities for Radiation in Participating Media You can see this functionality used in the following models: When combined with the Composite Materials Module, a new multiphysics feature makes it possible to model thermal expansion in layered structures. When combined with the AC/DC Module, new multiphysics coupling features enable the modeling of electromagnetic heating and the thermoelectric effect in layered structures. The new functionality is available in all the heat transfer interfaces that include functionality for analyzing shells, thin layers, thin films, and fractures. A new Layered Material dataset makes it possible to visualize results in thin, layered structures as if they were originally modeled as 3D solids. Optional tools for lumped modeling methodology are available for reducing the computational cost for both thermally thin or thermally thick structures.
![comsol multiphysics tutorial example 1 5.4 comsol multiphysics tutorial example 1 5.4](https://www.featool.com/doc/thermal_bridge1_51_50.png)
In addition, the interfaces between each thin layer can be assigned separate interface properties. Each layer is assigned a material property, intrinsic rotation, thickness, and finite element discretization settings. Layered structures are defined using a new Layered Material feature that includes load/save of layered structure configurations from/to a file, a Layer Cross Section Preview feature, and a Layer Stack Preview feature. The functionality for heat transfer in thin structures has been dramatically expanded with a new set of powerful tools for modeling layered shells. Heat Transfer in Thin, Layered Structures The sketch on the right represents a similar case for a perfectly focused beam on specular surfaces.
![comsol multiphysics tutorial example 1 5.4 comsol multiphysics tutorial example 1 5.4](https://cdn.comsol.com/wordpress/2016/06/COMSOL-Desktop.png)
For highly specular surfaces, the beam is reflected multiple times before it vanishes, while it is immediately damped for pure diffuse surfaces. The different configurations correspond to different surface properties, from a nearly ideal specular surface to a pure diffuse surface. Incident irradiation induced by a radiation nonfocused beam bouncing on the two sides of a channel (left). You can find this functionality used in the Surface-to-Surface Radiation with Specular Reflection model.
![comsol multiphysics tutorial example 1 5.4 comsol multiphysics tutorial example 1 5.4](https://www.chemicalprocessing.com/assets/Media/1107/comsol0727.jpg)
The new ray-shooting method can also be used for modeling semitransparent surfaces that are not fully opaque, but instead transmit a fraction of the incident irradiation, for example, window glass. The new capability for handling a mixture of diffuse and specular reflections can be used to create realistic and accurate models of a wide range of surfaces. Smooth, mirror-like surfaces tend to reflect incoming rays according to the law of reflection where the angle of incidence is equal to the angle of reflection, known as specular reflection. Rough surfaces tend to reflect incident rays randomly in all directions regardless of incident direction, known as diffuse reflections. Mixed Diffuse-Specular Reflections and Semitransparent SurfacesĪ new algorithm for view factor computations, based on a ray-shooting method, can handle mixed diffuse-specular reflections as well as reflections and transmissions through semitransparent surfaces. Learn about these heat transfer features and more below. For users of the Heat Transfer Module, COMSOL Multiphysics ® version 5.4 includes mixed diffuse-specular reflection and semitransparent surfaces for modeling surface-to-surface radiation, heat transfer in thin structures, and more capabilities for modeling radiation in participating media interfaces.