Struts are activated once the excavation reaches their depths by using a boolean expression. Next, lets take a look at the settings of the General Extrusion coupling operator. It is also possible to define the mapping in terms of coordinate systems. Discussion Closed This discussion was created more than 6 months ago and has been closed. The destination map here consists of the transient coordinates where we would like to evaluate temperature. Thank you for your time. Forming an assembly creates an identity pair between the wall soil and wall diaphragm boundaries. Center: Temperature along the parabola. The velocity field is given by u and v, the fluid velocity in the x and y-directions, respectively. Examples of the General Extrusion Operator - COMSOL You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version 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 parameters J_s, q, k, \textrm{and } T represent the following, respectively: the saturation current density, the electronic charge, Boltzmanns constant, and temperature. The flow solution on this unit cell is also plotted, as shown below. You can find it at page 348: . The general extrusion operation applies a rotational transform. Hi, It can be used for a variety of different purposes, examples of which are presented here. General Extrusions makes no exclusions with its extrusions. Good luck 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! listed if standards is not an option). As the excavation deepens, three struts are activated using a ramp function, and boolean expressions. In other words, the operators define the point-to-point map. Note: This discussion is about an older version of the COMSOLMultiphysics software. The General Extrusion operator will map data from the boundary into the volume, along the z direction, as shown in the following screenshots. We are then looking at the problem of evaluating the temperature at a point that follows the rotating wafer material. But finally COMSOL basics is a PDE solver tool for a given subset of useful functions, of the type used for common physics (that fits in the global or coefficient form. 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. A pressure constraint at a single point is used to gauge fix the pressure field. Several cases are illustrated in the table below. A destination map and source map is specified here. This approach, as explained earlier, is limited to cases in which the source and destination are related by affine transformations. In this model, a laser moves radially inwards and outwards over a silicon wafer that is rotating on its stage. General Extrusions is owned and run by the Schuler family. The video shown below uses the latter of the two strategies to model a 26-meter excavation. This is why i need to convert u(x,t) back to its original form, u(x,y). Add a soil plasticity node and you can see that the yield criterion is DruckerPrager, but we still want to match it to the Mohr-Coulomb criterion. Instead, at every destination point, it first evaluates T_d(x_d,y_d) and carries out a mesh search operation to find the point on the source where this evaluation matches T_s(x_s,y_s). Because the source entities are different, two operators are needed. The rest of the boundary loads will describe the three struts. Good luck The working fluid is water with properties defined at room temperature and pressure. listed if standards is not an option). 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. Modeling Linear Motors or Generators in COMSOL Multiphysics A typical microfluidic device. The periodic modeling domain and the fluid flow solution. A linear mapping built using a General Extrusion operator. Here, we will demonstrate how to accomplish this using the General Extrusion component couplings in COMSOL Multiphysics. 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. Hello Oluwaseyi, This sounds like a case of a variable name used twice, but you may want to reach out to the support team for help. 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. However, if we neglect the structure near the inlet and the outlet, we can reasonably assume that the flow within the channel bends will be identical between the unit cells. General Extrusion - COMSOL Multiphysics The species concentration (shown in color) is solved in all three repeating domains. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version The company produces standard and custom aluminum extrusions for manufacturers in the appliance, medical equipment, transportation, and automotive markets, among others. Extrusion operators are used to construct pointwise relations between source and destination points. Adding a General Extrusion coupling operator.The green vector field is the transport term used to model the wafer rotation. Where might you use it in your multiphysics modeling? The General Extrusion operator is used to define the velocity field in all three periodic domains. 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. Why are all the domains selected? I suppose by point 2 you are referring to the second plot. Hi The final project, on the other hand, tasked us with designing a retaining wall to match certain specifications a tough and lengthy assignment. The default plot shows the von Mises stress. Once a strut is activated, it will generate a force proportional to the struts stiffness and the horizontal displacement. An initial stress is added to the model as well to simulate the in-situ stresses in the x, y, and z directions. A general extrusion operator can be evaluated at any point where the destination map expressions are defined. Both source and destination are two-dimensional, as well as the intermediate mesh (srcdim = idim = dstdim). Finite element model of the micro electrode array has been. Settings used to map data from a boundary parallel to the xy-plane along the z direction. In such cases, we can use projection, integration, average, maximum, or minimum component couplings. 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. Examples of the General Extrusion Operator - COMSOL Multiphysics Name: genext1 To explore the use of General Extrusion operators in other types of situations, consult the following blog posts: By providing your email address, you consent to receive emails from COMSOL AB and its affiliates about the COMSOL Blog, and agree that COMSOL may process your information according to its Privacy Policy. How to use the General Extrusion coupling operator to probe a solution at a moving point http://comsol.com/c/10mb Here is an interesting question: How can we easily probe the solution at a point that is moving in time, but associated with a stationary geometry?. 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. At the outlet, we want the species to be well mixed. These indices are, in a sense, coordinates of an intermediate mesh, and a General Extrusion operator matches source and destination points that have the same intermediate coordinates. At a point P_d in the destination entity, we want to compute a quantity that is a function of another quantity defined at the source entity. Part 2: Mapping Variables with General Extrusion Operators - COMSOL A symmetry is used because the modeled excavation is only the right half of the full excavation. Version 4.1 Note that V refers to the electric potential at a point on the top side while genext2(V) refers to the electric potential vertically on the bottom side. general extrusion from 2D geometry to 2D geomtry - comsol.fr Although it is not strictly necessary to do so, the mesh is copied from the one domain used to solve for the fluid flow to all of the other domains. 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. Please can you explain what I am doing wrong? In the results, how is Point 2 related to the general extrusion? listed if standards is not an option). Also, are there other approaches to do this? Your internet explorer is in compatibility mode and may not be displaying the website correctly. 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. Linear Extrusion - COMSOL Multiphysics Take a look at the figure below. Sample data defined on the xy-plane, centered at the origin. General Extrusion Variable - comsol.it 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. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version If the nonlocal couplings you want to simulate are not included in the built-in features of COMSOL Multiphysics, you can use the strategies youve learned today to implement them. When this check box is left unchecked, COMSOL Multiphysics assumes that we have explicit expressions for each coordinate of the source as functions of coordinates of the destination. Note: This discussion is about an older version of the COMSOL Multiphysics . Therefore, only a single operator is needed to map the velocity field into all of the domains. Therefore, we can greatly reduce our model by solving only for the fluid flow within one unit cell and patterning this flow solution throughout the modeling domain for the convection-diffusion problem. Clear the selection and add the middle strut, then change the expression from stage 1 to stage 2 to activate it only when the depth moves below the second strut. Nonlocal Couplings and Coupling Operators - COMSOL Multiphysics Is there any tutorial for comsol general projections? listed if standards is not an option). Extrusion operators can be used to make couplings between points in the same component or different components. This site is under development. 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. Your internet explorer is in compatibility mode and may not be displaying the website correctly. CNC Machining for Aluminum Extrusions. The periodic velocity field, indicated by the arrows, is solved in one domain and mapped into the others. Click the player button again to view all the parameter values in succession. Add depth as the continuation parameter, and click the range button. Is it possible to "paste" two functions in COMSOL? (For reference: the model is approx. indeed I do not believe I really understand what you intend to do. Currently we are ISO 9001 certified. However, in general, we need to write the mathematical expression for the mapping. The parabola is the source. Shu Heng Khor . 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. http://www.comsol.com/model/laser-heating-of-a-silicon-wafer-13835, Multiscale Modeling in High-Frequency Electromagnetics. Oftentimes, however, we may not have explicit expressions. \rho C_{p} \frac{\partial T}{\partial t} + \rho C_{p} \mathbf{u} \cdot \nabla T = \nabla \cdot (k \nabla T). This is reasonable to do since it is assumed that the flow field is independent of the species concentration. Stay tuned! With a voltage terminal at the bottom of the device and ground at the top of the device, the following results are obtained. The top and bottom surfaces are thermally insulated, and there are no heat sources. Then we add three distributions, one corresponding to each of the mapped mesh distributions. The two circles in the geometry have centers at the origin and radii of 1.0 and 1.5. For example, if the intermediate mesh is in 2D space, there is no z-expression field. Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction. The Micromixer tutorial, available in our Application Gallery, is an example of such a model. 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. Posted 15 feb 2011, 16:18 UTC It is also possible to define the mapping in terms of coordinate systems. It can be used for a variety of different purposes, examples of which are presented here. The applied heat load is described via a user-defined function, hf (x,y,t), that describes how the laser heat load moves back and forth along the x -axis in the global coordinate system. And when you check the legends box, the plot will automatically be generated. listed if standards is not an option). To add a General Extrusion operator, we go to Definitions > Component Couplings > General Extrusion. Editing and Repairing Imported Meshes in COMSOL Multiphysics, Exploiting Hardware Parallelism with COMSOL Batch Sweeps, The Graphics Window: Effective and Beautiful Postprocessing, Thank you so much for this article, I was in need of something that shows the mathematical operations of the extrusion coupling. BLOG Using the General Extrusion Coupling Operator in COMSOL: Dynamic Probe BLOG Accessing Nonlocal Variables with Linear Extrusion Operators KNOWLEDGE BASE Understanding the Fully Coupled vs. Mapping of data defined on a cross section (left) around an axis of symmetry and into a volume (right). It also provides design assistance and engineering support. It can be used for a variety of different purposes, examples of which are presented here. We want a depth ranging from 0 to -26 meters with a step size of two meters. If excavating close to a retaining wall, youre subjecting it to additional forces it was not originally designed for, and it may require subsequent support. This approach is also useful in other analyses including structural contact or surface-to-surface radiation in heat transfer. Within the original domain, a displacement of zero is used. Thanks for replying. Now that the velocity field is defined throughout the modeling domain, the species concentration at the inlet is defined via the Inflow boundary condition. Your internet explorer is in compatibility mode and may not be displaying the website correctly. In this example, since the x, y, and z-coordinates of the destination map are explicitly specified without any association with the coordinates of a geometric entity, it doesnt matter where we evaluate the General Extrusion coupling operator. 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. This button displays the currently selected search type. For the final part of the physics set up, we are going to add five boundary loads to the model. Computing and Visualizing Satellite Orbits in COMSOL, Introduction to the Elastic Waves, Time Explicit Interface. Now we will create a 1D plot and a line graph, with the wall diaphragm as the selection.

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