Physics Interface Guide

The table lists the physics and mathematics interfaces in COMSOL Multiphysics and the availability for 1D, 1D axisymmetric, 2D, 2D axisymmetric, and 3D geometries.


Physics interface		Icon	Tag	Space Dimension	Available Preset Study Type
AC/DC
Electric Currents			ec	All dimensions	Stationary
Electrostatics			es	All dimensions	Stationary; Time Dependent
Magnetic Fields			mf	2D, 2D axisymmetric	Stationary; Frequency Domain
Acoustics
	Pressure Acoustics
	Pressure Acoustics, Frequency Domain		acpr	All dimensions	Eigenfrequency; Frequency Domain
Chemical Species Transport
Transport of Diluted Species			tds	All dimensions	Stationary; Time Dependent
Fluid Flow
	Single-Phase Flow
	Laminar Flow		spf	3D, 2D, 2D axisymmetric	Stationary; Time Dependent
Heat Transfer
Heat Transfer in Solids			ht	All dimensions	Stationary; Time Dependent
Heat Transfer in Fluids			ht	All dimensions	Stationary; Time Dependent
	Electromagnetic Heating
	Joule Heating1		—	All dimensions	Stationary; Time Dependent
Structural Mechanics
Solid Mechanics			solid	3D, 2D, 2D axisymmetric	Stationary; Eigenfrequency; Time Dependent
Mathematics
Wall Distance			wd	All dimensions	Stationary; Time Dependent
Curvilinear Coordinates			cc	All dimensions	Stationary; Eigenvalue
	PDE Interfaces
	Coefficient Form PDE		c	All dimensions	Stationary; Time Dependent; Eigenvalue
	General Form PDE		g	All dimensions	Stationary; Time Dependent; Eigenvalue
	Wave Form PDE		wahw	All dimensions	Time Dependent
	Weak Form PDE		w	All dimensions	Stationary; Time Dependent; Eigenvalue
	PDE, Boundary Elements		pdebe	3D and 2D	Stationary
	Lower Dimensions
	Coefficient Form Boundary PDE		cb	All dimensions	Stationary; Time Dependent; Eigenvalue
	Coefficient Form Edge PDE		ce	3D	Stationary; Time Dependent; Eigenvalue
	Coefficient Form Point PDE		cp	3D, 2D, 2D axisymmetric	Stationary; Time Dependent; Eigenvalue
	General Form Boundary PDE		gb	All dimensions	Stationary; Time Dependent; Eigenvalue
	General Form Edge PDE		ge	3D	Stationary; Time Dependent; Eigenvalue
	General Form Point PDE		gp	3D, 2D, 2D axisymmetric	Stationary; Time Dependent; Eigenvalue
	Weak Form Boundary PDE		wb	all dimensions	Stationary; Time Dependent; Eigenvalue
	Weak Form Edge PDE		we	3D	Stationary; Time Dependent; Eigenvalue
	Weak Form Point PDE		wp	3D, 2D, 2D axisymmetric	Stationary; Time Dependent; Eigenvalue
	ODE and DAE Interfaces
	Global ODEs and DAEs		ge	All dimensions	Stationary; Eigenfrequency; Time Dependent; Frequency Domain; Eigenvalue
	Domain ODEs and DAEs		dode	All dimensions	Stationary; Time Dependent; Eigenvalue
	Events		ev	All dimensions	Time Dependent
	Boundary ODEs and DAEs		bode	All dimensions	Stationary; Time dependent; Eigenvalue
	Edge ODEs and DAEs		eode	3D	Stationary; Time dependent; Eigenvalue
	Point ODEs and DAEs		pode	3D, 2D, 2D axisymmetric	Stationary; Time dependent; Eigenvalue
	Optimization and Sensitivity
	Optimization Requires the Optimization Module		opt	All dimensions	Stationary; Eigenfrequency; Time Dependent; Frequency Domain; Eigenvalue
	Sensitivity		sens	All dimensions	Stationary; Eigenfrequency; Frequency Domain; Eigenvalue; Time Dependent (available with the Optimization Module)
	Classical PDEs
	Laplace’s Equation		lpeq	1D, 2D, 3D	Stationary
	Poisson’s Equation		poeq	1D, 2D, 3D	Stationary
	Wave Equation		waeq	1D, 2D, 3D	Time Dependent
	Helmholtz Equation		hzeq	1D, 2D, 3D	Stationary
	Heat Equation		hteq	1D, 2D, 3D	Stationary; Time Dependent
	Convection-Diffusion Equation		cdeq	1D, 2D, 3D	Stationary; Time Dependent
	Stabilized Convection-Diffusion Equation		scdeq	1D, 2D, 3D	Stationary; Time Dependent
	Deformed Mesh
	Deformed Geometry		dg	All dimensions	Stationary; Time Dependent; Frequency Domain; Eigenvalue
	Moving Mesh		ale	All dimensions	Stationary; Time Dependent; Frequency Domain; Eigenvalue
1 This physics interface is a predefined multiphysics coupling that automatically adds all the physics interfaces and coupling features required.