Simulation of Flow Over a Throttle Body - Steady State

This project purpose is to simulate the flow over an elbow body that contains a throttle using CONVERGE Studio. In this first part of the project, an steady state analysis will be set up. This means that the throttle will not move. This case helps set up the real analysis: check if the refinement of the mesh is the correct one and  the right physics equations are being solved. 

Case Setup.

First, the geometry is imported from CAD, and the boundary flagging is performed. An steady state pressure based solver is used, with a mesh grid size around 2mm using fixed embedding around the throttle. A typical RNG k-eps turbulence model is chosen.

Mesh

Detailed Mesh Distribution Around the Throttle

Results and Postprocessing.

Converge Studio allows to visualize the progress of the solver in different ways. One commonly used consists on automatically update the graphs of different variables at its graphic interface. In this case, the steady state solver means that the solution is reached when this variables of interest approach a constant value.

Simulation Progress:

Once the case was solved, the postprocessing took place in Paraview. There are different varaibles of interest in this case. The first thing is to check that the flow directions is right, and nothing strange happens. Then, a closer look to the throttle area is neccesary. In this area, both velocity changes and pressure changes are important.

Overall Flow

The vector plot in this picture shows that the simulation took place in the right direction. But it also can be appreciated how the throttle affect the flow, as there are less vector plots (less velocity, less flow) right after it, due to the deattachment in the back. The result is a low pressure area at the other side of the throttle, as this is blocking the flow.

Velocity around the Throttle Area

Taking a closer look at the velocity around the throttle we can see how there is a de-attachment after the throttle, and how the small opening can accelerate the flow passing through it.

Pressure at the Throttle

Further detail of the pressure field, not only around the throttle but also on it, shows the expected results. The throttle serves as a block to the flow, and therefore the pressure increases before it, but it suddenly drops downstream. Note however that the throttle is not exactly symmetrical, this is, the opening at each side are not the same size. Because of this, we can see downstream a different pressure and velocity distribution in the top and bottom of the pipe.

It seems like the mesh grid and all physical phenomema are right (this is, not alarming results) and therefore the case is ready for a transient simulation.


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