Interaction with CindyLab

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Interaction with CindyLab

The simulation environment: `simulation()`

Description: This operator provides a handle to the simulation environment. The simulation environment offers several fields than can be used to access its global properties.

Name	Writeable	Type	Purpose
`friction`	yes	real	total friction of the simulation
`gravity`	yes	real	total gravity of the simulation
`kinetic`	no	real	total kinetic energy of the simulation
`ke`	no	real	total kinetic energy of the simulation
`potential`	no	real	total potential energy of the simulation
`pe`	no	real	total potential energy of the simulation

Applying a force: `addforce(<mass>,<vec>)`

Description: Applying a force <vec> to an existing mass <mass>. This operator is useful to implement user defined force fields. It should be called in the Integration Tick slot.

Applying a force: `setforce(<mass>,<vec>)`

Description: Setting the force <vec> for an existing mass <mass>. This operator is very useful to implement user defined force fields. It should be called in the Integration Tick slot.

Probing particle forces: `force(<vector>)`

Description: The operator force is closely related to physics simulations in CindyLab. It can be used for testing the force that would affect a mass particle at a specific position. The vector <vector> represents the position. The operator returns a two-dimensional vector that is the force at this position. If no modifiers are used, the operator assumes that the probe particle has mass=1, charge=1 and radius=1 (see Free Mass).

Example: The following picture was generated using the drawforces operator and a color plot of the force operator. It shows the force field and force strength of the electrostatic field of two charges.

A.charge=(|C,G|-3)*3;
B.charge=(|E,H|-3)*3;
f(x):=max((0,min([x,1])));
colorplot([0.1,0.1,0.1]+hue(f(abs(force(#)/3))),(-10,-10),(20,10));
drawforces(stream->true,move->0.2,color->[0,0,0],resolution->10);

Modifiers: It is also possible to set the values of mass, charge and radius explicitly. Each of these values can be set by a modifier of the same name. If at least one of these values is set explicitly, then all unset values are set to zero. Thus force([0,0],charge->2) tests the force that would be present for a particle of charge=2, mass=0, and radius=0 at point [0,0].

Contributors to this page: Wurster , Richter and Kortenkamp .
Page last modified on Thursday 10 of July, 2014 [08:18:13 UTC] by Wurster.

The content on this page is licensed under the terms of the License.

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Interaction with CindyLab