Base de connaissances du support

Understanding the Fully Coupled vs. Segregated approach and Direct vs. Iterative Linear Solvers

Solution numéro: 1258 Versions: Toutes les versions

How, and why, switch between a fully coupled and a segregated approach to solving a multiphysics model? How, and why, switch between the direct and iterative linear system solver? ## Fully Coupled versus Segregated ...

---

Solving electromagnetic heating models with high-frequency loads

Solution numéro: 1257 Versions: Toutes les versions

I am solving a Multiphysics problem involving electromagnetics and heat transfer. The electromagnetic fields are varying at a constant frequency, and the period is very short compared to the timespan over which the ...

---

I get an error message when trying to open my glTF-file in an external viewer

Solution numéro: 1256 Versions: 5.4

After exporting a glTF-file from my COMSOL Multiphysics model, I get an error message when I try to open it in an external viewer. The most probable cause for this issue is that the external glTF-file you are using ...

---

Reducing the amount of solution data stored in a model

Solution numéro: 1255 Versions: Toutes les versions

My models contain a lot of solution data, and I do not want my file sizes to get too large, it takes a lot of disk space. What can I do to reduce file size? Will this reduce the time it takes to solve the model? File ...

---

Controlling the Time Dependent Solver Timesteps

Solution numéro: 1254 Versions: Toutes les versions

I am solving a transient model and changed the stepsize in the Times: field in the Study Settings, but the solver is still taking exactly the same timesteps. It seems the timesteps that the solver is taking are not ...

---

Solving Wave-Type Problems with Step Changes in the Loads

Solution numéro: 1244 Se réfère à: COMSOL Multiphysics Versions: Toutes les versions

I am solving a transient model and am expecting the solution to oscillate over time in response to step changes in the loads. How should I set up such a model? What solver changes should I make? Certain models will ...

---

License Error -5,414 in COMSOL Multiphysics

Solution numéro: 1252 Versions: Toutes les versions

I receive the following or similar error message: License error: -5 No such feature exists Feature: SERIAL License Path: C:\...\license.dat FlexNet licensing error:-5,414 This error is either triggered from the ...

---

Running parametric sweeps, batch sweeps, and cluster sweeps from the command line

Solution numéro: 1250 Versions: Toutes les versions

This solution describes how to launch a parametric sweep, a batch sweep, or a cluster sweep simulation in COMSOL Multiphysics® from the command line. ## Short Summary Model methods are presented as a concept to ...

---

"Data access entity removed" occurs in my application

Solution numéro: 1247 Versions: Toutes les versions

When running my application, I get the error "Data access entity removed". If a node is removed, Data Access to the node becomes invalidated. In general this error occurs if nodes used in Data Access are explicitly ...

---

Solving Models with Step Changes to Loads in Time

Solution numéro: 1245 Versions: Toutes les versions

How should I model loads that change magnitude at a particular time? I am solving a transient model which has loads that change instantaneously in time, but the solver appears to be missing some of these changes in ...

---