Running the simulation
Running the simulation is as easy as pushing the button when you defined the model. This sounds easy and it really is. When the model is not complete, properties are missing or invalid properties have been used (like a negative thickness for example), RTM-Worx does the most reasonable job possible. The ability to run the simulation at any time makes it possible to use it to verify the correctness of the model. When you run the simulation, the filling of the mould will proceed in small time steps that are governed by the element size. You can define the increment of fill at which results are saved. The increment is typically set to 1% (saves about 100 steps) to 5% (the default, will save about 20 time steps). The calculation can be aborted anytime and continued where you stopped it.
RTM-Worx uses a combination of the Finite Element and Control Volume methods to solve the flow of the resin. Two basic elements types are available:
Actually, for the types of elements used, the formulation for the FEM and CV methods is
identical. This is important because it allow the use of one single method to calculate (1)
pressures and velocities and (2) to track the progression of the flow front. It also ensures that
continuity of mass is mathematically exact. Of course, the model is an approximation of reality,
but the fact that the calculation is consistent makes RTM-Worx very reliable and allows you to use
and trust it without specialised and detailed knowledge of the underlying theory. Simply repeat a
calculation with a refined mesh (a few clicks with the mouse) and you'll know the accuracy of
the predicted filling time!
For a user-defined number of time steps, the results are written to file. Sufficient
information is saved to display all results and to restart the calculation.
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