Master's Thesis - Computer Graphics and Visualization - TU Delft

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5.1.3 Build a program
Figure 5-4 Instruction of Module Interface
The previous section shows how to create a module in the sequence view. A simulation application can
be built by creating a sequence of modules. Figure 5-5 shows an example of “Hybrid simulation” built
in the sequence model. In this example three kinds of molecules are created: “water”, “oil” and
“surfactant”. Among these molecules, “oil” molecules are concentrated in a sphere. (It is a drop of oil).
The red area in Figure 5-5(b) refers to this oil droplet. “Water” molecules are distributing in the other
area out of the oil drop. And then 100 surfactant molecules are added to this environment (see the white
and blue molecules in Figure 5-5(b)). Then the properties of each kind of molecule and the
relationships among these molecules are specified. The properties about this environment such as the
temperature are set as well. At the end, the parameter simulationstep is set.
Figure
5-5(a) shows a part of this application. Clicking the “run” item in the menu, the program will be
executed. Figure 5-5(b) shows the initial state of the simulation. Figure 5-5(c) is a visual display
generated during of the simulation. And Figure 5-5(d) is the end result of the simulation. As can be seen
from these images, the surfactants first distribute randomly in the whole area. Then they move to the oil
gradually, and finally all of them surround the oil droplet.
In the concept model, the creation of an instance of a module is almost the same as in the sequence
model. The only difference is that only some kinds of modules are allowed to a certain area. For
example, if the space is used to place the modules from SetViewer, the modules which are not belong to
this category like DPDCalculator cannot be put in this space.
Figure
5-6 and Figure 5-7 show a DPD simulation program built in the concept model. First, when a
DPD template is initialized, the system will show the general steps as can be seen in Figure 5-6(a).
Then the first step “box1”(shown in Figure 5-6(b)), two instances of module createDPDMolecules are
created. These two modules are used to add two molecules, Water and Oil. In the second step
View1( Figure 5-7(a)), an instance of module AddDPDMoleucleViewable is created. In this module,
only molecules Oil are chosen. So in the simulation window, only modules Oil will be displayed. Then,
in the third step, Simulation1 (Figure 5-7(b)), an instance of the module Setbeadsinteractions and an
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