Today, we will start to take a behind-the-scenes look at how the equations are discretized and solved numerically. With this in mind, we have decided to share the truth about our classes, in a rather unique way. This chapter will outline the data sets, derived values, COMSOL Multiphysics provides the solution at that time using interpolation. It is a fast growing high tech engineering software company with a proven track record and a vision as a future leader of the industry. Is there something like Ut or Ux for the time or space derivative of U ? The initial condition, which gives a smooth transition step near z = 0, are the following: Notes About the COMSOL Implementation The simplified geometry is quite straightforward to create using the drawing tools in On this machine, COMSOL can handle up to 600 spheres. This example is a highly nonlinear problem and benefits from taking an iterative Glassdoor… Course Content Days 1 & 2, 12:30pm - 5:00pm. Save this information to a file. I need to give the solution of the previous time step to my function. These checkpoint files are easily recovered when running the COMSOL solution on your local computer, but … Pros: I have been using this software for the past 10 years and have witnessed the growth of this software.COMSOL is one of the best software to date for Multiphysics applications. Posted 03.03.2021, 00:51 GMT-8 General, Modeling Tools, Equation-Based Modeling Version 5.5 1 Reply a) What initial values does COMSOL choose for this new feature (since there is no solution for this part available)? To do this, we need learn: How to run COMSOL file and do parameter sweep through MATLAB. We can implement this behavior in COMSOL Multiphysics via the Previous Solution operator and a little bit of equation-based modeling. The elastic strain energy density is decomposed into two individual parts resulting from compression and tension, respectively. Then use this file to provide the initial conditions in time dependent model. For a list of such trademark In order to study the effect of bicycle speed, we varied the initial forward velocity of the bicycle from 2.6 m/s to 6.6 m/s in steps of 1 m/s. Such behavior can be modeled by introducing a temperature-dependent specific heat function that is different if the material has been heated or cooled past a certain point. As mentioned in a previous blog post, in general holography, the object beam is a beam scattered from an arbitrary object. There, "Dan" mentioned the "stopping condition" option, found in solver parameters, which can in the recent versions easily be utilized to stop a deforming mesh simulation in the case that the mesh deformation gets too harsh and mesh quality diminishes "too much". However, the COMSOL results do not match with my previous solution. Posted 24 mars 2013 à 04:53 UTC−7 0 Replies Some of the distinct advantages I have experienced are: 1. × Warning Your internet explorer is in compatibility mode and may not be displaying the website correctly. Cons. As in the previous model, the boundary conditions are kept insulating. previous inquiry about mesh deformation issues. COMSOL, COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, and LiveLink are either ... A Previous Solution subnode to the Time Dependent Solver node handles field variables that have to be accessed at a previous parameter value or time. In many cases we need to break a simulation into smaller parts. 1 Solution of Electrostatics Problems with COM-SOL This section gives examples demonstrating how Comsol can be used to solve some simple electrostatics problems. These checkpoint files are easily recovered when running the COMSOL solution on your local computer, but using checkpoint files from the HPC is a bit more involved. This post continues our blog series on the weak formulation.In the previous post, we implemented and solved an exemplary weak form equation in the COMSOL Multiphysics software.The result was validated with simple physical arguments. COMSOL Multiphysics provides the solution at that time using interpolation. I will also need the value of the time step. When we compute the solution to a fluid flow problem, the COMSOL® software solves for the components of velocity (u,v,w) and the relative pressure (p). Browse the threads and share your ideas with the COMSOL community. As for COMSOL，I am now using an HEDT platform with Nvidia Graphics. × Warning Your internet explorer is in compatibility mode and may not be displaying the website correctly. Attendees that have developed solutions in COMSOL Multiphysics for other physics and are looking to expand their capabilities to solid mechanics are encouraged to attend. You need to manually update the MATLAB root directory path. Let’s find out how… COMSOL does not start with the latest MATLAB version Solution Number: 1113 Versions: All versions. using previous COMSOL solution as initial value for another solution. So I can use synctrayzor normally. COMSOL BV provides software solutions for multiphysics modeling. Previous knowledge of structural mechanics is not necessary. In holographic data storage, the object beam is a single beam carrying one-bit data or a beam passing through a spatial light modulator (SLM) carrying multibit data. Comsol: How to use initial conditions of previous study for next study.Continuous Solution! The setting for Reuse solution from previous step then determines how the solutions are reused between multiple continuation sweeps, ... 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. Pros. These checkpoint files are easily recovered when running the COMSOL solution on your local computer, but … Posted 18.11.2011, 02:14 GMT-8 Studies & Solvers Version 4.2 1 Reply . The State Variable feature simplifies the tracking of the history of a field over time. I have installed a new MATLAB version, but running COMSOL with MATLAB keeps opening the older version of MATLAB. With the release of version 5.5 of the COMSOL Multiphysics® software, there is a feature for tracking the state, or history, of your model. COMSOL 3.5a on a PC with 16 compute cores and 64 GB of main memory. Then, once we have established confidence in doing this, we can I have solved the problem analytically and approximately. Draw a plane wall of three layers in the Comsol program. For a convenient numerical solution procedure of the nonlinear system of equations with good conditioning, the variables are transferred to a dimensionless form. 1 Solution of Electrostatics Problems with COM-SOL This section gives examples demonstrating how Comsol can be used to solve some simple electrostatics problems. 3.1. You can use the at operator to compare two solutions at different times during results evaluation; for example, at(30,u)-at(20,u) is the difference between the solution at 30 s and the solution at 20 s. All COMSOL-specific notations are written in italics. There are a few methods available for using solutions as starting point values in COMSOL Multiphysics®. hello, save the file as (.M file), and try to open it with comsol 3.3..maybe its can be open.. jalal dehghannya <***@yahoo.com> wrote: Hello Meriem, This was a problem that I also came across with it. Comprehensive Biomaterials Volume is indexed by Thomson Reuters CPCI-S (WoS). Read employee reviews and ratings on Glassdoor to decide if Comsol Computer Solutions is right for you. 3.2. I may do something wrong with COMSOL modeling ( I am not COMSOL professional). Engineering & CAD/CAM Projects for $10 - $30. the COMSOL® software, we must start with the numbers—the data needed to do so. Given a monotonic list of values to solve for, the continuation method uses the solution to the last case as the starting condition for the next. Once a solution is found for the smallest desired T , the adaptive mesh refinement algorithm is used to refine the mesh to put more elements around the transition region. Contact Information Visit the Contact COMSOL page at www.comsol.com/contact to submit general inquiries, contact Technical Support, or search for an address and phone number. You can also visit the Worldwide Sales Offices page at www.comsol.com/contact/offices for address and contact information. In Comsol versions later than 3.2a Browse the threads and share your ideas with the COMSOL community. The previous existing phase-field models for quasi-static and dynamic crack propagation problems are reviewed and implemented in proper forms in COMSOL. and whose other Given that, The value of a = b = 24 The potential f(x) = 25 We have to find the steady-state temperature u (x, y) in the square plate 05.xs 24, Os y s 24 whose upper side is kept at potential 25°C sides are kept at The solution is given by u(x, y) = § 4, sin 1) 0°C. Dimensionless Parameters. Summary of the use of the laws to model soft or hard irons and the number of parameters to input. Note: This discussion is about an older version of the COMSOL Multiphysics ... How to set the initial guess not from my previous solution? The results of both solutions are almost identical. representative, go to other COMSOL websites, request information and pricing, submit technical support queries, subscribe to the monthly eNews email newsletter, and much more. At 5.6 m/s, the bicycle’s lean velocity damps to … Is there a way to use the stationary solution obtained in Comsol 4.2 as the initial conditions in a time dependent model? Job Seekers Also Viewed Previous Next. COMSOL, COMSOL Multiphysics, Capture the Concept, COMSOL Desktop, and LiveLink are either ... A Previous Solution subnode to the Time Dependent Solver node handles field variables that have to be accessed at a previous parameter value or time. So it won't bother me any more. How to do point evaluation from MATLAB. Following Habchi , Tan et al. In Comsol versions later than 3.2a Simulating Holographic Data Storage in COMSOL Multiphysics. About the COMSOL Product Suite. already solved using other methods, and compare the COMSOL Multiphysics procedure and results to the previous solutions obtained using an analytical method, the Shooting Method, and the Finite Difference Method. *For Effective B-H Curve, the function can be automatically calculated from the standard B-H curve with an example simulation app in the AC/DC Module Application Library.You can learn more about these capabilities in a previous blog post. There, "Dan" mentioned the "stopping condition" option, found in solver parameters, which can in the recent versions easily be utilized to stop a deforming mesh simulation in the case that the mesh deformation gets too harsh and mesh quality diminishes "too much". property of their respective owners, and COMSOL AB and its subsidiaries and products are not affiliated with, endorsed by, sponsored by, or supported by those trademark owners. You can simulate a terminated job by submitting the previous COMSOL job to the HPC and requesting 1 core for 2 minutes with Send Private Message Flag post as spam. By default, COMSOL periodically checkpoints its solution to safeguard against a program crash, or in case the job is terminated for exceeding its time limit. I want to conduct a simulation to find a solution (u) and its first derivative (ux) using a 3D stationary model. limit. 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. 1.1 Laplace’s Equation We start with a solution of Laplace’s equation, ∇2u = 0, where u is the potential. previous inquiry about mesh deformation issues. ?Subscribe - https://bit.ly/3q7M2xk How to restart COMSOL in parallel mode with a previous solution as the initial value? Uses COMSOL Multiphysics software Version 4.x and includes a DVD with models and code. Then, once we have established confidence in doing this, we can SOLUTIONS COMSOL HANDBOOK SERIES Paradoxically, although we will explore in detail the techniques used to create visual results in . using previous COMSOL solution as initial value for another solution. Jen-Hsuan Ho . Do you know how to get these solution in COMSOL ? determine the existence and nature of the stable solutions. Let’s find out how… The differential equations and boundary conditions for It seems you can not open a file in COMSOL 3.3 if you have created it in the 3.4 version. It is very easy to learn provided one must know the underlying theory behind the simulation, i.e. already solved using other methods, and compare the COMSOL Multiphysics procedure and results to the previous solutions obtained using an analytical method, the Shooting Method, and the Finite Difference Method. , Venner , and Lubrecht , the definitions are. Using COMSOL Multiphysics, we can greatly reduce our computational requirements for such problems by using General Extrusion component couplings and the Previous Solution operator. b) How can I change the initial values for the new geometry feature while still using the solution of the previous simulation as initial … The COMSOL discussion forum covers a wide variety of simulation topics. Solved with COMSOL Multiphysics 5.1 3 | COOLING AND SOLIDIFICATION OF METAL The melting temperature, T m, and enthalpy, H , are 1356 K and 205 kJ/kg, respectively. 1.1 Laplace’s Equation We start with a solution of Laplace’s equation, ∇2u = 0, where u is the potential. Let’s consider a wafer of silicon with a very thin layer of Such behavior can be modeled by introducing a temperature-dependent specific heat function that is different if the material has been heated or cooled past a certain point. ... Glassdoor has 1 Comsol Computer Solutions reviews submitted anonymously by Comsol Computer Solutions employees. These variables can also be used to affect other fields, such as material properties, and can thus be used to implement hysteresis into your model. The dimensions of the wall to be drawn are certain. We use MATLAB to run and sweep COMSOL file and extract the data after each sweep process. In previous versions of the COMSOL ® software, you could not start a Batch Sweep or Cluster Sweep from a batch command, but this functionality is now available with the new command-line options -mode batch and -mode desktop. As discussed in a previous blog post on introducing goal seeking into the segregated solver, one can augment a multiphysics model with an additional global equation within which we define how to update an input to a model such that a particular output is achieved. By default, COMSOL periodically checkpoints its solution to safeguard against a program crash, or in case the job is terminated for exceeding its time limit. Comsol is an awesome tool to simulate whatever you want. Comsol Networks, a leading provider of enterprise-grade licensed wireless infrastructure in South Africa, said that it has completed its trial of the Telecom Infra Project-incubated (TIP) Disaggregated Cell Site Gateway (DCSG) solution in its lab in South Africa.. The random packings are externally generated with a self-written MATLAB code according to the algorithm by Mueller [2] and imported into COMSOL multiphysics [3]. The thermal conductivity coefficients of the wall will be determined. )**External Magnetic Material is a suboption of the B-H curve. It really helps getting result faster if your simulation can have a result. Multiphysics Modeling of a Microfluidic Device with Periodicity However, if you have a model that is too large to be solved in one block and the errors that are introduced by the partitioning are acceptable, you can use LiveLink™ for MATLAB® to integrate a model .mph file with MATLAB®. This example extends the previous one from linear Lagrange elements, that is, with shape functions of polynomial degree 1, to higher-order elements with shape functions of polynomial degrees 2, 3, 4, and 5. Posted 03.03.2021, 00:51 GMT-8 General, Modeling Tools, Equation-Based Modeling Version 5.5 1 Reply We can implement this behavior in COMSOL Multiphysics via the Previous Solution operator and a little bit of equation-based modeling. This is a powerful tool and an amazing this is that you can use a computational server to unload your computer from running the number. You can use the at operator to compare two solutions at different times during results evaluation; for example, at(30,u)-at(20,u) is the difference between the solution at 30 s and the solution at 20 s. Anyway, thanks for your support very much. Using the Previous Solution Operator in Transient Modeling. COMSOL Multiphysics version 5.1 includes a Previous Solution operator within time-dependent studies. This operator allows you to evaluate quantities at the previous time step when using the default implicit time-stepping algorithm. Then, I used COMSOL multi-physics to do the same problem. The COMSOL discussion forum covers a wide variety of simulation topics. It is hard, really hard to use. Read Book Solved With Comsol Multiphysics 4 3a Heat Generation In A electrical and civil disciplines, this book presents the reader with a solved problem that utilizes the RF Module. Our COMSOL Training enables students to be leaders in solving problems with COMSOL Multiphysics. Solution to the problem: The best way of evaluating a point’s data is by using COMSOL live link with MATLB. Let us take a look at how this operator is implemented and then examine how it can be used for various modeling needs. When you are solving a transient model, the COMSOL software by default uses an implicit time-stepping algorithm with adaptive time step size. I have solved one of the problems——Synctrayzor provided a version update and prompts that hardware rendering needs to be turned off when using Xe Graphics. At 2.6 m/s and 3.6 m/s, the bicycle leans too much and is unstable. The solution, f(u solution) = 0, is Solution the point where r(u), is at a ... same equation from the previous section: r′(u) = b - Ku r″(u) = - K

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