MedCFD Demo Version 1.0b Help - Preprocessing  << | \\ | >>

This program provides automatic generation of a realistic geometric model of an aneurysm, using user-friendly interface. Aneurysm generation dialog is opened by choosing Generate->Aneurysm or in the toolbar. Only you have to do is preparing input for the geometric parameters of the aneurysm, choosing the mesh division (finer mesh gives better results, but requires more computation time), and choosing the value of the Reynolds number. If you don't like the result of the generation, which you can see in the moment, just return to the generation dialog and correct values. When you're satisfied with the generated model's geometry, you can run the calculation (Generate->FE Analysis, or  ) in order to get the values of  interest.

Description of the parameters

Geometric parameters of the aneurysm are shown in the following figure:

1. Aneurysm Parameters

- Length is the parameter which describes total horizontal projection of the generated aneurysm model.

- A is a height of the arc of central line.

- Aorta diameter is a normal physiological diameter of the abdominal aorta .

- B is a radius from central line to the inner wall of the aneurysm.

- C  is a radius from central line to the outer wall of the aneurysm.

- Aneurysm length is an average length of the Abdominal Aorta Aneurysm (AAA).

2. Smoothness

- This group of six parameters describes the pipe-aneurysm transition smoothness. Usually, you should keep the values of this group in the same order of magnitude with the parameter of Aneurysm length. Mathematically, the pipe-aneurysm transition is described using Bezier curves. Values of this group are actually the lengths of the tangents in the corresponding points.

All the geometrical parameters are given in centimeters (cm).

3. Mesh and Physical Parameters

- Layer division is an integer which describes the mesh division in a single layer of an aneurysm. Increasing of this parameter drastically extends the computation time and memory occupation, but of course gives the more precisely results.

- Number of Layers is an integer which represents total number of layers in the generated model. Increasing also extends the computation time, but not as much as previous parameter.

- Reynolds Number can be up to 200.

Animation   .