general extrusion comsol

How to Extrude, Revolve, and Sweep 2D Geometries in COMSOL - YouTube 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. For . 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. Part 2: Mapping Variables with General Extrusion Operators - COMSOL 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. For example, you can couple edges (boundaries) in 2D to edges in 3D; or couple 2D domains to 3D faces. The final project, on the other hand, tasked us with designing a retaining wall to match certain specifications a tough and lengthy assignment. This moving load is then transformed into the rotating coordinate system via the General . Given an expression defined on a plane, e.g., the xy-plane, it is desired to map this data along the z direction. I suppose by point 2 you are referring to the second plot. 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. It can be used for a variety of different purposes, examples of which are presented here. 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. One option involves a sweep of the geometry, removing the geometry (excavation) one step at a time. 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. Mit der Anmeldung erklre ich mich damit einverstanden, dass COMSOL meine Daten gem meinen Prferenzen und wie in der Datenschutzerklrung von COMSOL beschrieben erfasst, speichert und verarbeitet. General Extrusion Variable. Schematic diagram of COMSOL coupling with external code RMC. The Micromixer tutorial, available in our Application Gallery, is an example of such a model. Once the model has finished computing we can add some post processing to better view the results. Also, are there other approaches to do this? This variable should only exist on the . This works and solution time is reduced to 118s so much more in line with the case without gaps! 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. The ramp location is set to be -U_max. We begin by adding the General Extrusion coupling operator from the definitions toolbar as shown in the screenshot below: The same transforms can be implemented in three dimensions. We can then consider examples in which the General Extrusion operator must be used. In such cases, we can use projection, integration, average, maximum, or minimum component couplings. 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. indeed I do not believe I really understand what you intend to do. Modeling Linear Motors or Generators in COMSOL Multiphysics The plot below shows the graph for temperature evaluated at a point located 0.5 inches from the center of the rotating disk: Forming an assembly creates an identity pair between the wall soil and wall diaphragm boundaries. From such source-destination pairs, one can infer the general mapping from superposition. Currently we are ISO 9001 certified. The Copy Domain mesh feature can copy the mesh exactly, thereby avoiding any interpolation of the flow solution between meshes. The General Extrusion operator is used to define the velocity field in all three periodic domains. This applies a varying species concentration over the inlet boundary. A little calculus gives us the arc length of the parabola between the origin and the source point (x,y). 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. 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. listed if standards is not an option). 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. To implement the normal current boundary condition on side 1, we need access to the electric potential V_2 on side 2. One option is to use the General Extrusion coupling operator. Enter the expression for the general extrusion operator from earlier. Schematic of a microfluidic mixer that depicts the repeated unit cell and the inlet and outlet zones. Hi Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). Click replace expression and go to solid mechanics, displacement, and choose total displacement. The settings of the General Extrusion coupling operator are shown below: The extrusion operators constrain the normal displacement between the retaining wall and soil, forcing them to stay in contact. The temperature will vary linearly with x. 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. In the case of General Extrusion operators, we write out the mathematical description of the mapping for an arbitrary point in the destination. To add a General Extrusion operator, we go to Definitions > Component Couplings > General Extrusion. Frontiers | Development of multiphysics coupling system for nuclear Thus, two extrusion operators are required. There are two ways to model an excavation in COMSOL Multiphysics, both of which include a parametric sweep. Welcome to General Extrusions Inc. In general, the destination map accepts scalar values that may be space- or time-dependent expressions. Therefore, only a single operator is needed to map the velocity field into all of the domains. For the y-axis data, the expression is y, and for the x axis, the expression is u, with millimeters as units. A one-to-one source map makes the search return, at most, one source point for a given destination point. The Linear Extrusion operator defines a linear extrusion that maps between geometric parts of the same dimension. 3M dof and can be solved in 86s, when no gaps are present and we can rely on a conforming mesh). Discussion Closed This discussion was created more than 6 months ago and has been closed. Currently we are ISO 9001 certified. Now that the velocity field is defined throughout the modeling domain, the species concentration at the inlet is defined via the Inflow boundary condition. Now we can build the mesh and zoom in on the soil-wall boundary, to see the improved mesh. Your internet explorer is in compatibility mode and may not be displaying the website correctly. Mapping of data defined on a cross section (left) around an axis of symmetry and into a volume (right). How did you select the source in the general extrusion settings? 2 for the wall diaphragm totaling 60 elements, and one for the bottom boundary, with 3 elements. 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. listed if standards is not an option). The periodic velocity field, indicated by the arrows, is solved in one domain and mapped into the others. 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. I will always remember a Geotechnical Engineering class I took during the pursuit of my Civil Engineering degree. Extruding Data Along a Direction Therefore we want stress in the y-direction. To apply what we have learned thus far, lets now build a diode model using the Electric Currents physics interface in COMSOL Multiphysics. The corresponding normal current density for the Normal Current Density 2 node applied to edge 3 is -Js*(exp((V-genext1(V))/kTbyq)-1). Settings used to revolve data about the azimuthal axis of a cylindrical coordinate system. The general extrusion operation applies a rotational transform. We can choose a prescribed displacement to make sure the soil at boundary 4 only moves in the y direction. Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries, 2023 by COMSOL. Take a look at the figure below. 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. Once a strut is activated, it will generate a force proportional to the struts stiffness and the horizontal displacement. This graph shows the wall deflection or horizontal displacement as a function of depth for different excavation steps. Now we will use the operators in the physics nodes to implement the boundary conditions. Note that the source map needs to be one-to-one for the inverse to exist. General Extrusions, Inc. can provide complete aluminum extrusion components including your finish requirements. The General Extrusionoperator 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 time varying coordinates of the point at which we want to evaluate the temperature can be entered as the coordinates of the destination map. Consider thermal expansion with axisymmetric thermal boundary conditions and material properties. Using source and destination maps to define implicit relations between source and destination coordinates in a General Extrusion operator. Nonlocal Couplings and Coupling Operators - COMSOL Multiphysics An Outlet boundary condition is applied at the other end. In these first two examples, the Use source map check box in the Source section of the settings window has been left unchecked. The video shown below uses the latter of the two strategies to model a 26-meter excavation. Can you help me out? General Extrusion coupling operator settings. Within their design, a common goal is to achieve optimal mixing within a small surface area, hence the serpentine channel. Each side of the junction becomes a source entity in one of the extrusion operators, as depicted below. As you can see, they are in the same location but are different boundaries. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version First, did you only the repeating unit in your graphics window before using the General Extrusion and Periodic Boundary conditions node or was it the entire geometry? Box 3488 Youngstown, OH 44513. General Extrusion Variable - comsol.it It can be used for a variety of different purposes, examples of which are presented here. Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries. Both source and destination are two-dimensional, as well as the intermediate mesh (srcdim = idim = dstdim). With a voltage terminal at the bottom of the device and ground at the top of the device, the following results are obtained. Rename the third strut to finish off the physics set up. The last step before computing the model is defining a range of depth parameters for the parametric sweep. This is reasonable to do since it is assumed that the flow field is independent of the species concentration. 50K views 6 years ago Creating Geometries in COMSOL Multiphysics: Tutorial Series COMSOL Multiphysics contains a handful of tools to quickly and easily convert 2D planar geometries into 3D. Next, well look at how to use a General Extrusion operator to specify implicit relations. The approach we have applied here is appropriate for any instance in which a spatially repeating solution needs to be utilized by other physics. 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! To model such a situation, we want to solve the Navier-Stokes equations for the flow. Check out our Deep Excavation Model for more information. A linear mapping built using a General Extrusion operator. I am trying to use the same for droplet evaporation. 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. Since there is no displacement in the y-direction, the y-expression is set at its default y. Alternatively, from the Extrude from list, select Work plane to extrude objects from a work plane. 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. The geometry has been previously created for this model, but all the steps are outlined in the model file to build the upper and lower layers of the soil, as well as the retaining wall and three embedded struts. 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 stator boundary 33 is used as the source boundary in the General Extrusion operator. I am also troubled by such a problem of time-dependent coordinates. 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. listed if standards is not an option). I have only one small question, if you dont mind, you could maybe write the expressions of the variable disp. listed if standards is not an option). Several cases are illustrated in the table below. General Extrusion, Linear Extrusion . Sample data defined on the xy-plane, centered at the origin. General Extrusion - COMSOL Multiphysics Add depth as the continuation parameter, and click the range button. Take a look at the figure below. All selected faces must lie in the same plane. We can similarly evaluate the temperature at any other point. Multiscale Modeling in High-Frequency Electromagnetics. We want stress in the negative x-direction here. 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. It can be used for a variety of different purposes, examples of which are presented here. 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. Settings used to revolve data about the azimuthal axis of a cylindrical coordinate system. Mapping of data defined on a boundary (left) along the direction normal to the plane and into a volume (right). At the outlet, we want the species to be well mixed. Email: support@comsol.com. An initial stress is added to the model as well to simulate the in-situ stresses in the x, y, and z directions. The General Extrusion operator will map data from the boundary into the volume, along the z direction, as shown in the following screenshots. In other words, the operators define the point-to-point map. It can be done in one model if just the physics are changing. Modeling an Excavation in COMSOL. Both cases involve mapping between points that share the same x-coordinate. 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. Using a General Extrusion operator to refer to the electric potential at a point on the other side of the 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. All points in the domain with the same distance from the origin copy temperature from the same point on the parabola. However, if we want to use variables from a 2D axisymmetric component in the physics node of a 3D component (i.e., thermal expansion), we need to utilize General Extrusion operators. It is really a helpful example. Thanks in advance. Note that a Linear Extrusion operator cannot be used here. 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. 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. Mapping of data between different components in the model to perform submodeling, Mapping between components to extract results on different geometries. 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 schematic below illustrates that there are two fluid inlets, both of which carry the same solvent (water) but a different solute. Part 2: Mapping Variables with General Extrusion Operators When building the mapping, it is important to ask the following question: Given the coordinates of the destination point, how do we go to the source point? For this example, we will be modeling in 2D plane strain, using the solid mechanics interface and a stationary study. Disp is defined as one of three different scalars (0,1.5,3 mm) as per the fourth figure. Right: Temperature mapped from the parabola to the domain. They appear in the Input faces list. Please feel free to contact us if you have any questions! so we choose 0.6 to be on the safe side. Right click again to duplicate it twice, since we want similar settings for the second and third struts. listed if standards is not an option). I would appreciate any help. 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.

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