The Application Gallery features COMSOL Multiphysics tutorial and demo app files pertinent to the electrical, mechanical, fluid, and chemical disciplines. You can download ready-to-use tutorial models and demo apps with step-by-step instructions for how to create them yourself. The examples in the gallery serve as a great starting point for your own simulation work.

Use the Quick Search to find tutorials and apps relevant to your area of expertise. Log in or create a COMSOL Access account that is associated with a valid COMSOL license to download the MPH-files.


Determining the Reaction Order from Pressure-Time Data

This model shows how to use the Parameter Estimation feature in the Reaction Engineering interface to find the rate constant and reaction order for the gas phase decomposition of di-tert-butyl-peroxide.

Modeling of an Enzyme-Based Biofuel Cell Anode

Enzyme-based biofuel cells (EBFCs) use biomass and specific enzymes known as biocatalysts in order to convert chemical energy into electrical energy. At the anode of an EBFC, the biomass (substrate) is oxidized to produce protons and electrons. Mediators are used in the anode to shuttle the electrons from enzymes to electrodes. At the cathode, the oxidant (oxygen) reacts with the protons and ...

Degradation of DNA in Plasma

Biotechnology is a rapidly growing area in the pharmaceutical sciences. One example of a clinical application is gene therapy, where it is possible to produce proteins in vivo, using the body’s own mechanisms for protein production. Major issues in gene delivery involve the transport of plasmid DNA (pDNA) to target sites and the conversion between different forms of pDNA. This example ...

Neutralization of Chlorine in a Scrubber

This example studies the kinetics of the neutralization of chlorine gas in water solution. The model assumes that the fluid volume is perfectly mixed and constant. This means that the chlorine has dissolved to an almost saturated state (1·10-2 mol/m3) and that the hydroxide has also mixed well throughout, as would be the case for a very small amount of fluid in a scrubber. The study allows ...

Creating a Phase Envelope with a Multicomponent Flash Calculation

* A flash calculation is an equilibrium calculation of a system where several components (species) and phases are present at the same time. This is a demonstration how to use the thermodynamics interface to make flash calculations from data provided external thermodynamic databases. The system in this model is Methane/Ethane/Propane, which would require 3D surfaces to plot the phase envelope. ...

Tank Series with Feedback Control

This example illustrates how to set up and solve a tank-in-series model in 0D using the Reaction Engineering interface. The model treats a series of three consecutive tank reactors. A feedback loop continuously adjusts the inlet concentration of the first tank to keep the concentration at the outlet of the last reactor close to a set level.

Parameter Estimation for Nonideal Reactor Models

Real reactors can be modeled as combinations of ideal reactors. In this example the so-called "Dead zone model" is utilized. Two ideal CSTRs with interchange are set up to model the real reactor. One CSTR represents the highly agitated region and the other the less agitated region. For this, two parameters relating the volume and exchange rate of the two regions need to be found by comparing ...

HI Batch Reactor

This tutorial example illustrates the versatility of the *Reaction Engineering* interface. The hydrogen iodine reaction is modeled in a batch reactor with constant volume. Both isothermal and non-isothermal conditions are modeled.

Isothermal HI Reactor

For a perfectly mixed reactor with a predefined constant temperature, the reacting system’s energy balance is not needed to describe the system behavior. The behavior is defined as the composition and the production or consumption of species over time. Furthermore, because the reactor is perfectly mixed, the Reaction Engineering interface can also set up a model even though it has no information ...

Fermentation in Beer Brewing

An important step in brewing beer is the fermentation process. Here, alcohol is formed together with various flavor substances from sugars in the presence of yeast. The initial sugar content, temperature, and yeast type dictates how the fermentation proceeds. This example models the fermentation process in a perfectly mixed tank with the Reaction Engineering interface. Additionally, it also ...