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Blog Posts Tagged Technical Content

Methods for Enforcing Inequality Constraints

September 17, 2018

Learn 2 methods for enforcing inequality constraints in your variational problems, the Lagrange Multiplier method and Augmented Lagrangian method, as well as the theory behind them.

Methods for Dealing with Numerical Issues in Constraint Enforcement

September 11, 2018

This post is helpful if you use equation-based modeling: Learn a variety of different methods for dealing with numerical issues when enforcing constraints in variational problems.

Specifying Boundary Conditions and Constraints in Variational Problems

September 7, 2018

In part 2 of a blog series on solving variational problems in COMSOL Multiphysics®, we discuss how to specify general boundary conditions and constraints.

How to Model the Compression of a Hyperelastic Foam

September 5, 2018

When characterizing hyperelastic materials, how do you ensure accuracy? Here, we show how to model the compression of a sphere made of an elastic foam using experimental data.

Introduction to Modeling Soap Films and Other Variational Problems

September 4, 2018

In this introduction to a 5-part series, learn how to solve variational problems using equation-based modeling, which is useful for modeling soap films, catenary cables, light beams, and more.

How to Model Ion-Exchange Membranes and Donnan Potentials

August 29, 2018

Get an introduction to the theory behind the Nernst-Planck-Poisson equations, Donnan potentials, and how to model ion-exchange membranes in batteries and fuel cells.

How to Model Sparging in COMSOL Multiphysics®

August 22, 2018

Sparging, the process of bubbling a gas into a liquid, is seen most notably in carbonation, such as for soda and seltzer water. This mass transfer process can be modeled in COMSOL Multiphysics®.

How to Place Inlet and Outlet Boundary Conditions in CFD Simulations

August 20, 2018

When setting up fluid flow simulations, at what distance can we apply boundary conditions without interfering with the process? Here, we discuss how to place inlet and outlet boundary conditions.


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