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. 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.
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