Assignment 11

Objective: To perform a GT - Power simulation for single cyl DI with discretization length of 0.1 mm for intake runner and compare with default case 1. Compare the performance parameters such as

• • Parameters-Torque, BSFC, max cylinder pressure
  • simulation time

2. Explore tutorial no 2 (GEM3D) - “Building intake manifold from STL model”

The following is the model for a single cylinder Diesel engine.

Here, the discretization length is defined as a parameter.

In the 'Run Setup' the following changes are required to be made.

The case setup is defined as follows:

Results:

The performance parameters such as Brake Torque and BSFC show very little change because of the change in discretization length.

The maximum pressure also show a changed value of 115.18 bar for a discretization length of 0.1 mm.

The only significant difference observed is in the simulation time and speed. For a discretization length of 0.1 mm, the simulation time is very high,hence concluding that the increase in discretization length requires a compromise on simulation accuracy.

In the above plot, it can be seen that real-time factor increases for case 2.

Explore tutorial no 2 (GEM3D) - “Building intake manifold from STL model” :

The intake manifold file is imported in the GEM3D application.

While importing the file, in order to get the surface data, the surface option is required to be selected.

After importing , the geometry looks as follows:

The different sections of the intake manifold are seperated using the ' Seperate by Curves' option in the 'Component' tab.

The inlet portion of the four intake ports is deleted afterwards.

The inlet ports are further defined by their size and shape as well as the fluid flow properties.

After converting all the sub-parts of the intake manifold , we can see that some part of the geometry can still be undefined which is then deleted.

After performing all the operations and redefining the geometry of inake manifold, the model is exported into Gt-Suite and then 'Discretization' is done while exporting.

The final model after importing into GT-Suite looks as follows:

This model can then be connected with another engine templates as the part of intake system.