# Application Gallery

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.

### Biomechanical Model of the Human Body in a Sitting Posture

The dynamic response of a human body in any vibration environment can be predicted using this biomechanical model. In the automobile industry for instance, this model can be used in ride quality simulation and designing vibration isolators such as seats. In this example, a biomechanical model of the human body is developed to evaluate the dynamic response to the vertical vibrations in a ...

### Dynamic Behavior of a Spring Loaded Rotating Slider

This model illustrates the modeling of slider motion caused by a base rotation. The motion of the slider is analyzed under various forces such as inertia force, centrifugal force, spring force and damping force. The prismatic joint, which is used to connect the two components, is spring loaded and also includes damping effects. The motion of the slider is compared with the analytical ...

### Slider Crank Mechanism

This is a benchmark model to test the numerical algorithms in the area of multibody dynamics. This model simulates the dynamic behavior of the slider crank mechanism. This mechanism goes through singular positions during its operation. The acceleration at a point is compared with the results from the reference.

### Simulating the Motion of a Bicycle on a Flat Surface

This model demonstrates the motion of a bicycle with a hands-free rider when given an initial forward velocity and perturbed with a lean about the forward axis. This is implemented through the Multibody Dynamics module in COMSOL. The wheels of the bicycle have been modelled assuming knife-edge contact with the ground and pure rolling constraints have been implemented. Stability analysis was ...

### Truck Mounted Crane Analyzer

Many trucks are equipped with cranes for load handling. Such cranes have a number of hydraulic cylinders controlling the motion, and several mechanisms. In this application, a rigid body analysis of a crane is performed in order to find the payload capacity for the specified orientation and extension of the crane. This application also provides the usage of hydraulic cylinders and highlights ...

### Andrew's Squeezing Mechanism

This is a benchmark model for rigid body dynamics. This model simulates the dynamic behavior of "Andrew’s squeezing mechanism", which is force driven and requires a very small time scale. Various angles in the mechanism are compared with the results from the reference.

### Optimization of a Crane Link Mechanism

In complex mechanical systems, it can be challenging to find an optimal (or even good enough) solution only through engineering insight or trial-and-error procedures. Using mathematical optimization methods can then be an efficient path to a better design. In this example, a link mechanism in a crane modeled in the Multibody Dynamics module is optimized using the Optimization module. The target ...

### Four-Bar Mechanism with Assembly Defect

This is a benchmark model for flexible multibody dynamics. This model simulates the dynamic behavior of a planar four-bar mechanism when one of the joints has a defect. The out-of-plane motion in the mechanism, caused by the defect in the joint, is compared with the results from the reference.

### Walking Instability in a Washing Machine

Walking instability, due to non-uniform distribution of clothes, is a common problem in lightweight portable washing machines. This problem is more severe in horizontal-axis washing machines, which are more popular because of their high efficiency in spite of high manufacturing cost. This model simulates a simplified model of a horizontal-axis portable washing machine and predicts the verge of ...

### Rolling of a Rigid Wheel

The purpose of this model is to demonstrate pure rolling of a rigid wheel when given initial forward velocity together with lean about the forward direction. This is implemented through the Multibody dynamics module in COMSOL Multiphysics. The rolling motion of the wheel has been implemented without the use of contact.