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. It can be used for a variety of different purposes, examples of which are presented here. Now that the velocity field is defined throughout the modeling domain, the species concentration at the inlet is defined via the Inflow boundary condition. The source domain(s) can be the domain(s) on which the destination point(s) are defined. 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. As the excavation deepens, three struts are activated using a ramp function, and boolean expressions. at an interface. Your internet explorer is in compatibility mode and may not be displaying the website correctly. A symmetry is used because the modeled excavation is only the right half of the full excavation. Once a strut is activated, it will generate a force proportional to the struts stiffness and the horizontal displacement. Using a General Extrusion operator to refer to the electric potential at a point on the other side of the junction. Is it possible to do this within GUI, or do i have to do it via MATLAB? Oftentimes, however, we may not have explicit expressions. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Please feel free to contact us if you have any questions! 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. 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. From such source-destination pairs, one can infer the general mapping from superposition. Examples of the General Extrusion Operator - COMSOL A typical microfluidic device. 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. A destination map and source map is specified here. This gap means that we cannot connect them via pair-based continuity conditions and we then resort to the General Extrusion coupling to connect the ~2000 disjoint boundaries however with the default settings it fails to find suitable source points across the large gaps one solution is then to go to Advancedand switch the Mesh search method to Closest point- this works, but with one notable drawback: Solution time for our 3M DOF model is now 2233s the factor of 26 in solution time relative to the model without couplings can be costly, if we are to use our model in any kind of auxiliary-/parametric sweep or optimization loop. For the y-axis data, the expression is y, and for the x axis, the expression is u, with millimeters as units. Thus, the latter quantity from a source point P_s needs to be copied to the destination entity. Phone: (330) 783 0270 Fax: (330) 788 1250 Email: sales@genext.com P.O. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). Left: Temperature varies linearly from left to right. Because the source entities are different, two operators are needed. Settings used to revolve data about the azimuthal axis of a cylindrical coordinate system. The General Extrusion coupling's 'Mesh search method' is very important for model performance in largers models #resolventtip: Get the best performance out your 'General Extrusion'-coupling in Comsol 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. Now that the velocity field is defined throughout the modeling domain, the species concentration at the inlet is defined via the Inflow boundary condition. Each side of the junction becomes a source entity in one of the extrusion operators, as depicted below. This works and solution time is reduced to 118s so much more in line with the case without gaps! listed if standards is not an option). Your internet explorer is in compatibility mode and may not be displaying the website correctly. We were the first North American aluminum extruder to achieve ISO 9002 Certification. Thanks for replying. The final project, on the other hand, tasked us with designing a retaining wall to match certain specifications a tough and lengthy assignment. General extrusion is one way to couple. Since there is no displacement in the y-direction, the y-expression is set at its default y. If the structural boundary conditions are not axisymmetric, we can save time by performing an axisymmetric thermal analysis in one component, and then mapping the temperature from the 2D axisymmetric domain to the 3D domain for structural analysis in another component. We want a depth ranging from 0 to -26 meters with a step size of two meters. In 4.0a, I can define a general extrusion coupling, and the source domain is applies to. Where might you use it in your multiphysics modeling? In the General Extrusion settings window shown above, the labels under Destination Map and Source read x^iexpression and y^iexpression rather than xexpression and yexpression. Mapping of data defined on a cross section (left) around an axis of symmetry and into a volume (right). It can be used for a variety of different purposes, examples of which are presented here. The General Extrusion operator will map data from the boundary into the volume, along the z direction, as shown in the following screenshots. Temperature evaluated at a point on the rotating wafer. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). Click the player button again to view all the parameter values in succession. Multiscale Modeling in High-Frequency Electromagnetics, 2023 by COMSOL. In an upcoming blog post, we will walk you through how to use the operator to map cross-sectional data from one or several cross sections onto another cross section for geometries where the cross section dimensions do not change over the length of interest. Posted 15 feb 2011, 11:18 GMT-5 Version 4.1 3 Replies . The parts can exist in geometries of different space dimensions. Add boundary 8 and change the y-axis data expression to v and use millimeters as the unit. 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. 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. Thanks in advance. Here, V refers to the electric potential at a point on the bottom side, while genext1(V) refers to the electric potential vertically on the top side. The companys manufacturing operations, which include a Youngstown, Ohio plant, comprise 220,000 square feet. It is also possible to define the mapping in terms of coordinate systems. 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. I have only one small question, if you dont mind, you could maybe write the expressions of the variable disp. Using source and destination maps to define implicit relations between source and destination coordinates in a General Extrusion operator. Note that a Linear Extrusion operator cannot be used here. How much easier it could have been had we only known about geomechanics simulation software. A 2D parabolic curve given by \frac{y}{d} =(\frac{ x}{d})^2 is in a square domain of side d. Our task is to build an operator that maps data from this curve (represented in blue in the figure below) to different parts of the square. Ivar. I wonder when will you post about Mapping Cross-Sectional Data? 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 this example, we will be modeling in 2D plane strain, using the solid mechanics interface and a stationary study. Lets now explore how to use a General Extrusion operator to copy data from a 2D axisymmetric component to a 3D component, such that the source and destination points correspond to the same point in space. A prescribed displacement is also needed for the wall_soil boundary created earlier. Part 2: Mapping Variables with General Extrusion Operators - COMSOL In the case of General Extrusion operators, we write out the mathematical description of the mapping for an arbitrary point in the destination. I suppose by point 2 you are referring to the second plot. I am also troubled by such a problem of time-dependent coordinates. Settings used to map data from a boundary parallel to the xy-plane along the z direction. I believe so, you need to define how your "y" is reduced, that is is it simply dropped or do you integrate along y ? Digging into COMSOL's Geomechanics Module | COMSOL Blog 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. Modeling Linear Motors or Generators in COMSOL Multiphysics As you can see, they are in the same location but are different boundaries. The General Extrusion operator is used to define the velocity field in all three periodic domains. The Shockley diode equation for the current-voltage (I-V) relation is used at the junction. Add depth as the continuation parameter, and click the range button. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries, 2023 by COMSOL. -- I defined a general extrusion operator, then defined variables such as T_sf = genext1(comp1.T), Y_sf = genext1(Y) and so. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). 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?. Gaining Understanding of Complex Phenomena with Virtual Laboratories, The Graphics Window: Effective and Beautiful Postprocessing, How to Use Maximum Likelihood for Parameter Estimation in COMSOL, Thank you for your Blog. The settings for this feature are illustrated below. 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. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Finite element model of the micro electrode array has been. I need to obtain a whole bunch of data in the variables section, ef., Mass fraction, Density and others. Hi, The same transforms can be implemented in three dimensions. Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction.
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