listed if standards is not an option). Your internet explorer is in compatibility mode and may not be displaying the website correctly. Lets consider a point on the disk at a distance of 0.5 inches from the center of the disk located at (0,0). This computed flow field can then be used as input for the convection-diffusion equation governing the species concentration. This problem can be solved by using a General Extrusion coupling operator to dynamically map the solution at a particular point (moving or stationary) onto a fixed source. this defines if you should us a linear or general Extrusion or Projection Extruding Data Along a Direction. The general extrusion operation applies a rotational transform. General Extrusions specializes in providing secondary fabrication operations to transition an aluminum extrusion to a finished component. Considering a variable defined on the xy-plane within a unit square centered at the origin, as shown above, it is possible to implement a variety of transforms simply via different destination maps, and leaving the source map unchanged. I am trying to implement the Periodic Boundary condition in a 3D model by following your post but I have some questions. The settings for this feature are illustrated below. Nonlocal Couplings and Coupling Operators - COMSOL Multiphysics The information provided may be out of date. Ce consentement peut tre retir tout moment. Additional settings are shown below. This can be useful for analysis; for example, to probe the solution at a point that is moving in time but is associated with a stationary geometry. If the mapping is affine, it is sufficient to know how some points in the source correspond to points in the destination entity. Create a second plot group and surface plot, then enter in the expression solid.epe>0 to view the plastic deformation in the different soil layers. Considering a variable defined on the xy-plane within a unit square centered at the origin, as shown above, it is possible to implement a variety of transforms simply via different destination maps, and leaving the source map unchanged. Thank you for your time. If you have already computed the solution to the finite element problem, then you can simply evaluate temperature at the destination points by clicking on the update solution option in the Study toolbar, or you can dynamically probe the variable genext1(T) evaluated at a point while you compute the solution to the finite element problem. Once a strut is activated, it will generate a force proportional to the struts stiffness and the horizontal displacement. Submit feedback about this page or contact support here. Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction. The flow solution on this unit cell is also plotted, as shown below. This worked perfectly for a point moving on a surface. Your internet explorer is in compatibility mode and may not be displaying the website correctly. The effect of the rotation of the wafer is modeled through a transport term in the governing heat transfer equation: The transport term in this equation, \bf{u}, is used to account for the rotation of the wafer, so it is not necessary to explicitly rotate the geometry. Good luck To add a General Extrusion operator, we go to Definitions > Component Couplings > General Extrusion. I wonder when will you post about Mapping Cross-Sectional Data? Using General Extrusion Operators to Model Rotation | COMSOL Blog For circular periodicity, a rotation matrix, not a linear shift, must be used in the destination map. Temperature evaluated at a point on the rotating wafer. Examples of the General Extrusion Operator - COMSOL Multiphysics The plot below shows the temperature evaluated at the focal point of the moving laser: Today, we have discussed how to use General Extrusion operators to create mappings for copying variables from one part of a simulation domain to another. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Mapping of data defined on a cross section (left) around an axis of symmetry and into a volume (right). It contained both the high and low points for that academic semester; the lab portion was a lot of fun, learning about (read: playing with) the different soils and clays existing in the state of Georgia. For example, you can couple edges (boundaries) in 2D to edges in 3D; or couple 2D domains to 3D faces. When using Linear Extrusion operators, we visually indicate the mappings for enough points (bases) and COMSOL Multiphysics figures out how to transform the remaining points. In the course of building multiphysics models, we often encounter situations in which the solution to one physics is periodic or very nearly so while the solutions to other physics of interest are nonperiodic. We have discussed how the General Extrusion component coupling can be used to set up a linear pattern of a periodic solution as part of a multiphysics analysis. This button displays the currently selected search type. How did you select the source in the general extrusion settings? Data transfer between components is performed using the COMSOL built-in "General Extrusion" coupling operator, and the iterative study steps are controlled using "For" and "End For" nodes in COMSOL. The General Extrusion operator maps expressions defined on a source to an expression that can be evaluated on any destination geometry where the destination map expressions are valid. The periodic velocity field, indicated by the arrows, is solved in one domain and mapped into the others. The geometry has been previously created for this model, but all the steps are outlined in the model file to build the upper and lower layers of the soil, as well as the retaining wall and three embedded struts. In this blog post, we will take a look at how to use the General Extrusion coupling operator to probe a solution at a point in your geometry, and illustrate how to implement a dynamic probe using an example model. The rest of the boundary loads will describe the three struts. In this example, a 26-meter excavation is modeled by means of a parametric sweep, with a step size of 2 meters. General Extrusion coupling operator settings. Extruding Data Along a Direction 3M dof and can be solved in 86s, when no gaps are present and we can rely on a conforming mesh). Now we can add the boundary constraints, including a symmetry on the left, a fixed constraint for the bottom boundary, and a roller for the right boundaries. General Extrusion Variable - comsol.it We can tag the different sides as 1 and 2, as illustrated in the figure below. FIGURE 1. It is also possible to define the mapping in terms of coordinate systems. From the graph below, can you see why the plot of arcext(T) on the right shows a radial variation? Here, the p-n junction in a diode is represented by a thin gap in the geometry. This is reasonable to do since it is assumed that the flow field is independent of the species concentration. Schematic diagram of COMSOL coupling with external code RMC. Discussion Closed This discussion was created more than 6 months ago and has been closed. The number of destination map expressions is the same as the space dimension of the intermediate mesh. Center: Temperature along the parabola. In this model, a laser moves radially inwards and outwards over a silicon wafer that is rotating on its stage. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version We want an operator that will copy from a point on the parabola to a point in the square, such that the distance of the destination point from the origin is equal to the length of the segment of the parabola between the origin and the source point. The company's manufacturing operations, which include a Youngstown, Ohio plant, comprise 220,000 square feet. The parts can exist in geometries of different space dimensions. It can be used for a variety of different purposes, examples of which are presented here. This is exactly why COMSOL Multiphysics allows us to specify implicit relations between source and destination coordinates by using two mappings: the destination map and the source map. Part 2: Mapping Variables with General Extrusion Operators - COMSOL I defined a general extrusion operator, then defined variables such as T_sf = genext1(comp1.T), Y_sf = genext1(Y) and so. The same transforms can be implemented in three dimensions. Now we will use the operators in the physics nodes to implement the boundary conditions. Now that we know how to find the corresponding coordinates of the source point, given any point (x,y) in the destination, we enter the right-hand side of the above equation (without the subscripts) in the destination map of the General Extrusion settings window. To implement, define a General Extrusion operator on a boundary parallel to the xy-plane, with the z-expression blank for both the Source Map and a Destination Map. The default plot shows the von Mises stress. This problem can be solved by using a General Extrusion coupling operator to dynamically map the solution at a particular point (moving or stationary) onto a fixed source. In this example, one expression is sufficient enough to uniquely relate any destination point in the square domain to a source point on the parabolic curve. General Extrusions, Inc. continues its tradition as a leading manufacturer of aluminum extrusions where quality always comes first. With the General Extrusion operator defined, we can now use it throughout the model. General Extrusion, Linear Extrusion . Now, if desired, it is possible to model the entire device shown above. To see how this General Extrusion operator maps variables, consider a plane stationary heat conduction problem with the left and right edges at temperatures of 300 K and 400 K, respectively. For example, to map data from a boundary around a centerline, introduce a cylindrical system, and use those coordinate system variables to define the source and destination map. I deplore the glaring oversight of COMSOL: Considering how frequently one encounters problems that include a combination of Rotationally-Symmetric and Cartesian components, that COMSOL has not seen fit to provide a specific operator for this case! In 4.0a, I can define a general extrusion coupling, and the source domain is applies to. Welcome to General Extrusions Inc.
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