Active microvalves are common components in microfluidic systems. In a thermomechanically actuated microvalve, an electric current generates movement by resistively heating the actuator structure, thereby causing mechanical stress and...
This example models the developing flow between two parallel plates. The purpose is to study the inlet effects in laminar flow at fairly moderate Reynolds numbers, in this case around 40. The problem might seem of academical nature...
Striking a drum excites a spectrum of vibration modes that together make up the instrument’s characteristic sound or acoustic signal. These vibration modes correspond to the eigenmodes, or eigenfunctions, of the drum’s membrane. Thus...
This example shows how to parameterize a CAD model by deforming the corresponding finite element mesh. The method enables geometry parameterization of non-parameterized CAD models such as: - models created by the built-in COMSOL...
This model describes the simultaneous transport of three solutes in a chain reaction within a variably saturated flow field. Involved are advection, dispersion, sorption, biodegradation, decay, and volatilization. The parent solute...
This is a benchmarking model to compare the abilities of COMSOL to an analytical solution. The model examines the sound-transmission properties of an idealized reactive muffler with infinitely long inlet and outlet pipes and one...
This model demonstrates how you can use the Level Set method and application mode to track an interface in a given velocity field. It also shows how the choice of the level set parameters influence the solution.
The example Stiffness Analysis of a Communication Mast’s Diagonal Mounting in the COMSOL Multiphysics Model Library shows how you can modify a 3D CAD model to improve its performance. In that case, the applied changes were based solely...
One way to fasten a gear to a shaft is by thermal interference. In preparation of the assembly, the shaft diameter is oversized and the gear thermally expanded in a heat-treating oven. At an appropriate expansion state, the gear is...
This model examines the physics of plane, incompressible and steady flow over a backward step in the absence of external forces. It addresses a common benchmark problem in the field of computational fluid dynamics. There is no known exact...
