Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries. FIGURE 1. The Periodic Flow condition is used to set the velocity so it is identical at the inlet and outlet boundaries, allowing us to specify a pressure drop over a single unit cell. The General Extrusion operator will map data from the boundary into the volume, along the z direction, as shown in the following screenshots. 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. It is also possible to define the mapping in terms of coordinate systems. Finite element model of the micro electrode array has been. This graph shows the wall deflection or horizontal displacement as a function of depth for different excavation steps. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). 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. The ramp location is set to be -U_max. the setting of the extrusion is shown in the attachment (the .PNG file ). Posted 15 feb 2011, 11:18 GMT-5 Version 4.1 3 Replies . The plot below shows the graph for temperature evaluated at a point located 0.5 inches from the center of the rotating disk: Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction. Hi They are not necessarily pertaining to the x or y coordinates in the source or destination. 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? Select the faces that you want to extrude in the Graphics window. Both source and destination are two-dimensional, as well as the intermediate mesh (srcdim = idim = dstdim). 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. 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. From such source-destination pairs, one can infer the general mapping from superposition. Your internet explorer is in compatibility mode and may not be displaying the website correctly. In practice, COMSOL Multiphysics does not construct an analytic expression for the inverse of the source map. The boundary condition at the top side is illustrated below. Lets consider a laser heating example where you have a moving heat source, the laser, and a moving geometry. To begin, lets focus on how to replicate a Linear Extrusion operator with a General Extrusion operator. Similarly, on side 2, we need access to the electric potential V_1 on the other side of the junction. A circular micro-electrode array with three phases is designed and prototyped using PolyMUMPs process for AC electro-osmotic flow pumping. Adding a General Extrusion coupling operator.The green vector field is the transport term used to model the wafer rotation. Shu Heng Khor . The variable Disp is individually defined within each of the three domains, as shown in the figure below. Thus, the latter quantity from a source point P_s needs to be copied to the destination entity. Linear Extrusion - COMSOL Multiphysics Settings used to revolve data about the azimuthal axis of a cylindrical coordinate system. Thank you Walter for a wonderful discussion. 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. Discussion Closed This discussion was created more than 6 months ago and has been closed. Email: support@comsol.com. This consent may be withdrawn. As the soil is removed, the support it supplies is removed as well, subjecting the retaining wall to soil stresses from the non-excavated side. Submit feedback about this page or contact support here. Is there any tutorial for comsol general projections? 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. We can choose a prescribed displacement to make sure the soil at boundary 4 only moves in the y direction. 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. I didn't mean to do integration, what i meant is something like: Thanks for replying. Settings used to revolve data about the azimuthal axis of a cylindrical coordinate system. From the Extrude from list, select Faces to extrude planar faces from the 3D geometry. Examples of the General Extrusion Operator - COMSOL 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. Please can you explain what I am doing wrong? Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction. It also provides design assistance and engineering support. Right: Temperature mapped from the parabola to the domain. 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. This time in the x direction and using the second general extrusion operator in the u0 field. General extrusion is one way to couple. Now you know how to use the General Extrusion coupling operator to probe a solution at a moving point. One option involves a sweep of the geometry, removing the geometry (excavation) one step at a time. It will always be requested to be evaluated at the destination coordinates entered in the settings of the General Extrusion coupling operator. This is why i need to convert u(x,t) back to its original form, u(x,y). Each side of the junction becomes a source entity in one of the extrusion operators, as depicted below. 2 for the wall diaphragm totaling 60 elements, and one for the bottom boundary, with 3 elements. Submit feedback about this page or contact support here. Hi They appear in the Input faces list. The settings for the General Extrusion operator and the definitions of the variable in the three domains. 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. In general, the destination map accepts scalar values that may be space- or time-dependent expressions. General Extrusion Variable. A similar boundary condition is used on the bottom side of the junction. Therefore, only a single operator is needed to map the velocity field into all of the domains. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version The source domain(s) can be the domain(s) on which the destination point(s) are defined. There are some models. This worked perfectly for a point moving on a surface. It also provides design assistance and engineering support. Thank you! 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. The results of the analysis, including the concentration and the mapped velocity field, are depicted below. At the outlet, we want the species to be well mixed. However, in general, we need to write the mathematical expression for the mapping. How did you select the source in the general extrusion settings? This approach helps avoid confusion if there is an extrusion or another operator also called genext1 or another variable called T in the second component. 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. Multiscale Modeling in High-Frequency Electromagnetics, 2023 by COMSOL. 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. It is also possible to define the mapping in terms of coordinate systems. 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. I would appreciate any help. Extrusion operators help us construct normal current density boundary conditions on each side of the ideal p-n junction. 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. I didn't mean to do integration, what i meant is something like: Add depth as the continuation parameter, and click the range button. Mapping of data defined on a cross section (left) around an axis of symmetry and into a volume (right). We want a depth ranging from 0 to -26 meters with a step size of two meters. General Extrusion, Linear Extrusion . Next, let's take a look at the settings of the . Thus, two extrusion operators are required. Add boundary 8 and change the y-axis data expression to v and use millimeters as the unit. Today, we will discuss General Extrusion operators, which are designed to handle nonlinear mappings and the mapping of variables between geometric entities of different dimensions. 3 Replies, Please login with a confirmed email address before reporting spam. The flow solution on this unit cell is also plotted, as shown below. The working fluid is water with properties defined at room temperature and pressure. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version A symmetry is used because the modeled excavation is only the right half of the full excavation. 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. I wonder when will you post about Mapping Cross-Sectional Data? It can be done in one model if just the physics are changing. Now that the velocity field is defined throughout the modeling domain, the species concentration at the inlet is defined via the Inflow boundary condition. I am also troubled by such a problem of time-dependent coordinates. COMSOL Multiphysics will take care of T_s^{-1}(T_d(x_d,y_d)), a necessary step in identifying the source coordinates. This applies a varying species concentration over the inlet boundary. Several cases are illustrated in the table below. 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. Take a look at the figure below. For the 2D model, I have computed the expression u(x,y). I would try to clarify further if necessary.

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