Solved with COMSOL Multiphysics 4.4 2 | MODELING FRICTION BETWEEN CONTACTING RINGS. The COMSOL Multiphysics ® software brings a user interface and experience that is always the same, regardless of engineering application and physics phenomena.. Add-on modules provide specialized functionality for electromagnetics, structural mechanics, acoustics, fluid flow, heat transfer, and chemical engineering. Note: This discussion is about an older version of the COMSOL Multiphysics ... By tuning the continuation parameter the solver should use a step of flag/10 during solution process. Adding a Global Equation to control the load. Send Private Message Flag post as spam. I want COMSOL to change the parameter by 0.2, and then solve the model, and then change the parameter by 0.2 again, etc. The COMSOL discussion forum covers a wide variety of simulation topics. At the center of rotation, the resultant of the gravity load P = 500 N) is applied to the inner ring. The latter basically ramp the doping and the themionic current to their final values." Is there a way to access the parameter value during solution for tuning? 80 Parameter value list (elastoplasticity) Posted 5 мая 2014 г., 01:56 GMT-7 3 Replies . The last step before computing the model is defining a range of depth parameters for the parametric sweep. How to use multiple parameter to generate the desire probe plots. Add depth as the continuation parameter, and click the range button. We demonstrate by studying a p-i-n diode's electronic response to ionizing radiation. by Walter Frei. This helps an easier ramp-up of the applied voltage V0 from equilibrium to the operating voltage of 1000 V. First voltage sweep with field-independent mobility by setting the continuation parameter cp to zero. If no continuation parameter is given, a plain sweep is performed where a solution is sought for each value of the parameters. In both cases, a Stationary Solver node plus a Parametric attribute is used. The other solver parametric sweep is done i.e. Parcourez les fils de discussion et partagez vos idées avec la communauté COMSOL. The information provided may be out of date. I defined a "flag" in the parameter list and use it as continuation parameter. Hi everyone, I have a simple … Right-click study 1 … Stationary (time-invariant) models with nonlinearities may converge very slowly. The information provided may be out of date. Posted 6 mai 2012 à 09:36 UTC−7 Acoustics & Vibrations, Results & Visualization, Studies & Solvers Version 4.2a 3 Replies The other way is to define a "Solver Continuation" sweep (under the Solver node tab), here you do not add an external Parametric Sweep node, but you tell the solver to loop around (and only the solver node, not the geometry, nor the mesh). The number of increments may need to quite large, and you will want to monitor at what values of the ramping factor there is slow convergence of the solver. The equation to be fulfilled is that the average displacement (defined through an average operator) should be equal to the continuation parameter (called disp in the screenshot below). The feature is designed to be used as a density method , meaning that the control parameters change a material parameter through an interpolation function. Please login with a confirmed email address before reporting spam. When continuation is enabled by setting Run continuation for to one of the parameters, ... By default, the COMSOL Multiphysics software determines these values heuristically depending on the physics as, for example, the specified initial values or a solution from an earlier study step. or natural frequenciesare certain discrete frequencies at which a In that case, the solver will be able to find the approximate failure load of the system, which is also very useful information. Browse the threads and share your ideas with the COMSOL community. The Continuation method is enabled by default when using the Auxiliary sweep study extension, as shown below. The Auxiliary Sweep can be used to implement ramping of any Global Parameter. A Global Parameter has to be introduced (in the above screenshot, P) and is ramped from a value nearly zero up to one. Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here. About the COMSOL Product Suite. I simply followed the steps of the 'Compression of an Elastoplastic Pipe' model given in Comsol file. Discussion Closed This discussion was created more than 6 months ago and has been closed. This algorithm is always used whenever the Continuation Method feature (or the Parametric Sweep feature) is used on a single parameter when solving a stationary problem. Mohamed Aymen Ben Hassen . We want a depth ranging from 0 to -26 meters with a step size of two … The COMSOL Multiphysics ® software brings a user interface and experience that is always the same, regardless of engineering application and physics phenomena.. Add-on modules provide specialized functionality for electromagnetics, structural mechanics, acoustics, fluid flow, heat transfer, and chemical engineering. Therefore, I would like to know if it possible to combine a Parametric sweep (concerning the geometric parameters) with an auxiliary one (containing the displacement only), or if there is any other way to efficiently tackle this problem. In Study 3, two study steps were utilized. Once the solver notices that convergence is not being reached, it will backtrack and try an intermediate value of the ramping parameter (in this case, 501). These variables are defined either within every element of the mesh or o… November 22, 2013. When a continuation parameter is selected, the continuation algorithm is run, which assumes that the sought solution is continuous in these parameters. 2) the solver "continuation parameter sweep" typically for steady state solvers, but also in some sens for frequency domain and temporal solvers. The method comes up with these new topologies by introducing a set of design variables that describe the presence, or absence, of material within the design space. Browse the threads and share your ideas with the COMSOL community. This approach is known as a Continuation Method with a Constant predictor. The Continuation method is enabled by default when using the Auxiliary sweep study extension, as shown below. The Auxiliary Sweep can be used to implement ramping of any Global Parameter. Want to learn how to simulate radiation effects in semiconductor devices? The default Initial Valuesfor the unknowns in most physics interfaces are I don't want the parameter to change by anything except 0.2 each time. Posted 2013年2月23日 GMT-8 上午12:48 Geometry, Materials Version 4.3a 1 Reply . 80 Posted 10 mars 2015 à 01:10 UTC−7 Structural Mechanics & Thermal Stresses Version 5.0 0 Replies . By default, for ALE, COMSOL proposes a fixed domain mesh and fixed = prescribed to "0" for all surrounding boundaries. Be sure the ALE applies only to the domain (=volume in 3D or surface in 2D) that you want to deform the mesh for, and NOT to the solid domain (perhaps v4.2 is somewhat different ?) As far as I have understood, the continuation solver can be used only with an Auxiliary Sweep. Create an alias if, for example, a desktop icon is required. Posted 7 gen 2013, 05:40 GMT-8 Fluid, Heat Transfer & Phase Change, Microfluidics, Chemical Reaction Engineering, Modeling Tools, Parameters, Variables, & Functions, Studies & Solvers Version 4.2 6 Replies . Auxiliary sweep continuation does not work. Discussion Closed This discussion was created more than 6 months ago and has been closed. Please login with a confirmed email address before reporting spam. For more details on the usage of Form Assembly, see Knowledgebase Article 1216. The other way is to define a "Solver Continuation" sweep (under the Solver node tab), here you do not add an external Parametric Sweep node, but you tell the solver to loop around (and only the solver node, not the geometry, nor the mesh). As the name suggests, topology optimization is a method that has the ability to come up with new and better topologies for an engineering structure given an objective function and set of constraints. COMSOL Update This application checks for available product updates on The COMSOL applications do not work if moved outside the COMSOL folder. Plot "set of curves" after parametric sweep with two variables (stationary study, heat transfer) Posted 26. nov. 2010 02.31 GMT-8 RF & Microwave Engineering Version 4.1 7 Replies COMSOL Update This application checks for available product updates on The COMSOL applications do not work if moved outside the COMSOL folder. If your geometry contains parts that are adjacent to each other, that have mating boundaries, the finalization method should be set to Form Assembly with the Create Pairs of pair type Contact Pair selected. the first one "In order to get a faster convergence, use the continuation parameter ramp to provide a good initial value to the nonlinear solver (10% of the desired value). Next we will look at solving the above example by using this technique. For boundaries which are not initially in contact, but which will come into contact during the simulation, you will need to manually crea… comsol continuation parameter, COMSOL Multiphysics Server This application launches the Terminal application and starts a COMSOL Multiphysics Server in a terminal window. Summary and Concluding Thoughts Approaches for solving nonlinear problems are shown, including load ramping, the continuation method, and how to choose initial conditions. Faster solvers, new graphics features, new products. The COMSOL Multiphysics ® software brings a user interface and experience that is always the same, regardless of engineering application and physics phenomena. You can download the full model from the Model Gallery. Therefore, I would like to know if it possible to combine a Parametric sweep (concerning the geometric parameters) with an auxiliary one (containing the displacement only), or if there is any other way to efficiently tackle this problem. For example, we can first assume field-independent mobility by setting the continuation parameter cp to zero. As far as I have understood, the continuation solver can be used only with an Auxiliary Sweep. Send Private Message Flag post as spam. Within this framework, it is shown that a concurrent bifurcation analysis may be carried out together with parameter continuation of the corresponding monodromy matrices. Send Private Message Flag post as spam. Load Ramping of Nonlinear Problems. Please login with a confirmed email address before reporting spam Hello It is possible to use a function as a parameter in the geometry. parameters. The COMSOL discussion forum covers a wide variety of simulation topics. This will automatically create Contact Pairs between mating boundaries of objects. After solving for a viscous ramping parameter of 1000, the software will try to solve with a ramping parameter of 1. As of COMSOL Multiphysics® software version 5.4, the add-on Optimization Module includes a density topology feature to improve the usability of topology optimization. in the "stationary" case, with the advanced node tab "Continuation", this will loop the solver sequences, BUT WILL NOT regenerate your geometry, nor your mesh and will use your initial conditions for the FIRST solver run, but will then use the last solver results as initial conditions for the next parameter sweep initial conditions. Solved with COMSOL Multiphysics 4.4 2 | MODELING FRICTION BETWEEN CONTACTING RINGS. Send Private Message Flag post as spam. As a case study, we consider a … Add depth as the continuation parameter, and click the range button. Chapter 4: COMSOL Simulations of the Skin Phantom 21 4.1 Overview of Subsystem 28 4.2 Software 22 4.3 Parameters 28 4.3.1 Geometry and Material 23 . Problem Description. A nonlinearity can be introduced into the model either in the governing equation, or by making any of the material properties, loads, or boundary conditions dependent upon the solution. By default, the Continuation Method will be used, which uses the solution from the previously solved step as the initial condition for the next step, thereby easing convergence. In parametric sweep I use for example the following parameter value: range(0.03,0.01,0.06) so it should only be four values that i'm trying to calculate now (when testing) We want a depth ranging from 0 to -26 meters with a step size of two meters. Does anyone know how to turn off step size tuning in parametric continuation? At the center of rotation, the resultant of the gravity load P = 500 N) is applied to the inner ring. For example I want it to change the parameter in steps of 0.2. Zdeno Zitny . That is, we use the continuation method to ramp from a (simple to solve) linear problem to a (more difficult) nonlinear problem. Comsol multiphysics provides embedded discretization algorithms capable of accommodating a great variety of mechanical/physical assumptions and multiphysics interactions. ... COMSOL Blog. Note: This discussion is about an older version of the COMSOL Multiphysics ® software. The Stationary solver is set up to run the continuation sweep. Eric Lemon . About the COMSOL Product Suite. Sal Tra . The last step before computing the model is defining a range of depth parameters for the parametric sweep. Note: This discussion is about an older version of the COMSOL Multiphysics ... Function as parameter. Use more increments when the convergence is slow. Create an alias if, for example, a desktop icon is required. Now in Study 1 --> Step 1 : Stationary-->Study extensions-->Continuation, the model proposes to add the parameter para in the 'Continuation parameter' column and the following : … Please login with a confirmed email address before reporting spam. To start a new discussion with a link back to this one, click here. Dear all, I tried to model deformation of two contact geometries, using thermal load. For User defined an input for the Continuation parameter appears and this should be set to a parameter with values between 0 and 1 to determine the scaling of the equation contribution. comsol continuation parameter, COMSOL Multiphysics Server This application launches the Terminal application and starts a COMSOL Multiphysics Server in a terminal window. For example, if there are two solver parameters, the entry 0 5 2 3 4 8 in the Parameter values edit field means that the parametric solver is called with the parameter-value pairs (0, 5), (2, 3), and finally (4, 8). For three solver parameters, the same list would correspond to the parameter sets (0, 5, 2) and (3, 4, 8). Le forum de discussion COMSOL couvre une grande variété de sujets de simulation. Adding the name of a parameter to this setting and ramping it from 0 to 1 in the continuation solver will gradually introduce the contribution into the equation system. We then use the same Newton method as before on a series of problems with the parameter \beta, getting ramped from zero to one.
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