Add a second distribution for the bottom boundary, and enter 2 for the number of elements. Such devices feature small channels that are filled with fluids carrying different chemical species. For meshing the model, sometimes an automatic mesh is sufficient, but we want to make our own for this model to improve convergence on the soil-wall boundary. Extruding Data Along a Direction Once the model has finished computing we can add some post processing to better view the results. 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. Create the ramp function for activating the struts. The boundary load applies a force on the excavation side of the retaining wall, equal to (and therefore negating) the in-situ stresses, for any part of the wall that is below the virtual excavation depth. have some questions. listed if standards is not an option). at an interface. En fournissant votre adresse email, vous acceptez de recevoir des emails de COMSOL AB et de ses filiales propos du Blog COMSOL, et acceptez que COMSOL traite vos informations conformment sa Politique de confidentialit. To map the solution from one domain into the other domains that are offset by a known displacement along the x-axis, the destination map uses the expression x-Disp for the x-expression. The final project, on the other hand, tasked us with designing a retaining wall to match certain specifications a tough and lengthy assignment. Now suppose we would like to evaluate the temperature at one point of the rotating wafer. Add a distribution for the wall diaphragm and enter 60 for the number of elements. At any given time, the (x, y, z) coordinates of this point are given by: (0.5[in]*cos(t), 0.5[in]*sin(t), 2.75e-4[m]), where is the angular velocity of the rotating wafer disk. General Extrusions, Inc. continues its tradition as a leading manufacturer of aluminum extrusions where quality always comes first. Settings for the General Extrusion operator defined on the stator boundary. listed if standards is not an option). At the outlet, we want the species to be well mixed. They appear in the Input faces list. We were the first North American aluminum extruder to achieve ISO 9002 Certification. Where might you use it in your multiphysics modeling? The plot below shows the graph for temperature evaluated at a point located 0.5 inches from the center of the rotating disk: Hi, The results of the analysis, including the concentration and the mapped velocity field, are depicted below. 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. The parabola is the source. A destination map and source map is specified here. Part 2: Mapping Variables with General Extrusion Operators - COMSOL Thus, two extrusion operators are required. 3M dof and can be solved in 86s, when no gaps are present and we can rely on a conforming mesh). Now we can build the mesh and zoom in on the soil-wall boundary, to see the improved mesh. And when you check the legends box, the plot will automatically be generated. This will allow you to compare different cross-sectional data and evaluate measures such as maximum, minimum, and average over several cross sections. In the 4.0a interface i do not know where to define the variable Va ( source) and its expression (V). I didn't mean to do integration, what i meant is something like: Thanks for replying. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. The following types of Extrusion Coupling Operators are available: For this example, we will be modeling in 2D plane strain, using the solid mechanics interface and a stationary study. General Extrusions, Inc. continues its tradition as a leading manufacturer of aluminum extrusions where quality always comes first. Thanks for replying. Select the top strut and then total force as the load type. For the y-axis data, the expression is y, and for the x axis, the expression is u, with millimeters as units. Hi Submit feedback about this page or contact support here. Each side of the junction becomes a source entity in one of the extrusion operators, as depicted below. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version For example, if you would rather follow the point on the geometry that corresponds to the focal point of the moving laser, you would enter the time-varying coordinates of the focal point of the laser. Ivar. One application of a General Extrusioncoupling is to mirror the solution on the x-axis. 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. Take a look at the figure below. 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. Add boundary 8 and change the y-axis data expression to v and use millimeters as the unit. Why are all the domains selected? I have a 1D model (time dependent) and a 2D model (stationary). Posted 15 feb 2011, 16:18 UTC this defines if you should us a linear or general Extrusion or Projection The reason is that x^i and y^i are indices for the first and second pairs of expressions used to define the source-destination relationship implicitly. There are four sets of results showing the deformation of the soil and retaining wall, the plastic deformation, wall deflection, and the surface settlement. -- You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version This consent may be withdrawn. Only the data in the z-expression is mapped. point 2 there simply involves time varying coordinates of the focal point of the laser beam in the example model : http://www.comsol.com/model/laser-heating-of-a-silicon-wafer-13835. This time in the x direction and using the second general extrusion operator in the u0 field. Posted 15 feb 2011, 11:18 GMT-5 Version 4.1 3 Replies . Rename this one Strut_2. Settings used to map data from a boundary parallel to the xy-plane along the z direction. The periodic modeling domain and the fluid flow solution. \frac{x_s}{2}\sqrt{1+4(\frac{x_s}{d})^2}+\frac{d}{4}\ln(2\frac{x_s}{d}+\sqrt{1+4(\frac{x_s}{d})^2}) = \sqrt{x_d^2+y_d^2}. A retaining wall is used to hold back soil from a region you dont want it to move to, such as a lower level of the ground. Now that we have the solution on one unit cell, we can use the General Extrusion component coupling to map the solution from this one unit cell onto the repeated domains. From such source-destination pairs, one can infer the general mapping from superposition. All you need are the time-dependent coordinates of the point where you would like to evaluate the temperature. This can be either an explicit definition of the source point P_s as a function of P_d or an implicit relation between P_d and P_s. The General Extrusion operator is used to define the velocity field in all three periodic domains. We can choose a prescribed displacement to make sure the soil at boundary 4 only moves in the y direction. The company produces standard and custom aluminum extrusions for manufacturers in the appliance, medical equipment, transportation, and automotive markets, among others. listed if standards is not an option). In addition to simply copying known quantities, these operators can be used to create nonlocal couplings between unknown variables, as illustrated in our p-n junction example. I have defined a general extrusion coupling operator to obtain the dependent variable (in my heat transfer case, the temperature "T") at a boundary. Center: Temperature along the parabola. Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries, 2023 by COMSOL. You can learn more about the use of projection operators in this previous blog post. Using a General Extrusion operator to copy data from the 2D axisymmetric domain to the corresponding 3D domain. 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. General Extrusion Variable - comsol.it Thank you Walter for a wonderful discussion. In the case of General Extrusion operators, we write out the mathematical description of the mapping for an arbitrary point in the destination. There are two ways to model an excavation in COMSOL Multiphysics, both of which include a parametric sweep. Click plot to view the displacement at the different excavation depths. Right-click study 1 to compute the model. The two circles in the geometry have centers at the origin and radii of 1.0 and 1.5. A similar boundary condition is used on the bottom side of the junction. General Extrusion, Linear Extrusion . This applies a varying species concentration over the inlet boundary. 2 for the wall diaphragm totaling 60 elements, and one for the bottom boundary, with 3 elements. Sample data defined on the xy-plane, centered at the origin. It is really a helpful example. In the COMSOL multiphysics user guide you can find a better explanation of how to use the general projection operator. A general extrusion operator can be evaluated at any point where the destination map expressions are defined. Currently we are ISO 9001 certified. 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 components of this velocity field are now defined in all of the repeated domains via the General Extrusion operator: genext1(u) and genext1(v), respectively. How much easier it could have been had we only known about geomechanics simulation software. When modelling in Comsol Multiphysics, we often have to map between entities a few examples: For these purposes the General Extrusion coupling is very powerful but it can also slow down solution of your model dramatically lets look at a, slightly artificial but illustrative, example. Alle Rechte vorbehalten. x_s = ax_d + by_d + e, \qquad y_s = cx_d + dy_d + f. r_s = \sqrt{x_d^2 + y_d^2}, \qquad z_s = z_d. Logging into your COMSOL Access account enables you to download the documentation for this model as well. How to Extrude, Revolve, and Sweep 2D Geometries in COMSOL - YouTube Your internet explorer is in compatibility mode and may not be displaying the website correctly. Right click again to duplicate it twice, since we want similar settings for the second and third struts. 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! Linear Extrusion operators are easier to build, but their utility is limited to affine transformations.General Extrusion operators are more general but take more work to define.

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