The model is solved in two steps first, the Laminar Flow physics interface is solved, and then the Transport of Diluted Species interface is solved. Please can you explain what I am doing wrong? Thanks for replying. The same transforms can be implemented in three dimensions. I hope I have not missed it. Several cases are illustrated in the table below. The settings for the General Extrusion operator and the definitions of the variable in the three domains. 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. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version One option involves a sweep of the geometry, removing the geometry (excavation) one step at a time. Temperature evaluated at a point on the rotating wafer. One option is to use the General Extrusion coupling operator. Thus, every point in the original domain is mapped along the positive x-direction by the specified displacement. at an interface. The following types of Extrusion Coupling Operators are available: Because the source entities are different, two operators are needed. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). The stator boundary 33 is used as the source boundary in the General Extrusion operator. Such devices feature small channels that are filled with fluids carrying different chemical species. 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. 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. In our earlier blog post on Linear Extrusion operators, we considered an affine mapping that pairs up points 1, 4, and 2 in the source domain to points 1, 5, and 3 in the destination domain. How to use the General Extrusion - COMSOL Multiphysics | Facebook Adding a General Extrusion coupling operator.The green vector field is the transport term used to model the wafer rotation. 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. Since there is no displacement in the y-direction, the y-expression is set at its default y. 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. (For reference: the model is approx. the destination map, not sure what the source frame should be. Add boundary 8 and change the y-axis data expression to v and use millimeters as the unit. Submit feedback about this page or contact support here. 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. The species concentration (shown in color) is solved in all three repeating domains. Right-click study 1 to compute the model. The settings of the General Extrusion coupling operator are shown below: Extrusion operators help us construct normal current density boundary conditions on each side of the ideal p-n junction. Previously on the blog, we introduced you to Linear Extrusion operators and demonstrated their use in mapping variables between a source and a destination. Now, add a free triangular for the remaining geometry. For questions related to your modeling, please contact our Support team. This applies a varying species concentration over the inlet boundary. 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. Thank you. 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. we first need to invert the expression L=\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}) and write x_s in terms of L. Thats no fun at all! 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. Several cases are illustrated in the table below. Lets consider a point on the disk at a distance of 0.5 inches from the center of the disk located at (0,0). The results of the analysis, including the concentration and the mapped velocity field, are depicted below. Submit feedback about this page or contact support here. As in Example 1, we enter the expression on the right-hand side in the destination map. Using the General Extrusion Coupling Operator in COMSOL: Dynamic Probe I suppose by point 2 you are referring to the second plot. Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries. -- The top and bottom surfaces are thermally insulated, and there are no heat sources. Logging into your COMSOL Access account enables you to download the documentation for this model as well. This graph shows the wall deflection or horizontal displacement as a function of depth for different excavation steps. 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. 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 other option is to start with the already excavated geometry, and simulate the excavation using a boundary load. Thus, the latter quantity from a source point P_s needs to be copied to the destination entity. To apply what we have learned thus far, lets now build a diode model using the Electric Currents physics interface in COMSOL Multiphysics. Can you help me out? To add a General Extrusion operator, we go to Definitions > Component Couplings > General Extrusion. I have the other model, where i would need this variable u, but this time, it is a 2D model, non time dependent. 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. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Extruding Data Along a Direction. Next, lets take a look at the settings of the General Extrusion coupling operator. Struts are activated once the excavation reaches their depths by using a boolean expression. The General Extrusion operator is used to define the velocity field in all three periodic domains. Then the naming and differentiation between time and spatial variables is . In the COMSOL multiphysics user guide you can find a better explanation of how to use the general projection operator. Forming an assembly creates an identity pair between the wall soil and wall diaphragm boundaries. Your internet explorer is in compatibility mode and may not be displaying the website correctly. Next, let's take a look at the settings of the . Shu Heng Khor . 2 for the wall diaphragm totaling 60 elements, and one for the bottom boundary, with 3 elements. The same transforms can be implemented in three dimensions. There are four sets of results showing the deformation of the soil and retaining wall, the plastic deformation, wall deflection, and the surface settlement. The same transforms can be implemented in three dimensions. The first boundary load is added for the horizontal soil boundaries. One application of a General Extrusioncoupling is to mirror the solution on the x-axis. To evaluate the temperature at the destination coordinates, you can call the General Extrusion coupling operator with a temperature argument, as genext1(T), where T is the dependent variable name for Temperature. Create a second line graph, showing the surface settlement, or vertical displacement, as a function of the distance from the wall. I am trying to implement the Periodic Boundary condition in a 3D model by following your post but I have some questions. We can then consider examples in which the General Extrusion operator must be used. Two boundary selections have been created and renamed wall_diaphragm and wall_soil. In other words, the operators define the point-to-point map. Why are all the domains selected? Take a look at the figure below. The temperature will vary linearly with x. Note that the operator name is kept to its default: genext1. 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. General Extrusion, Linear Extrusion . Your internet explorer is in compatibility mode and may not be displaying the website correctly. How much easier it could have been had we only known about geomechanics simulation software. How did you select the source in the general extrusion settings? A circular micro-electrode array with three phases is designed and prototyped using PolyMUMPs process for AC electro-osmotic flow pumping. Hi, Once a strut is activated, it will generate a force proportional to the struts stiffness and the horizontal displacement. We begin by adding the General Extrusion coupling operator from the definitions toolbar as shown in the screenshot below: When expanded it provides a list of search options that will switch the search inputs to match the current selection. 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. Simulation Organogenesis in COMSOL: Deforming and Interacting Domains
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