# Flow Over a Rotating Bridge CFD

Hi everyone,

This is my first post as I am a new member here.

I am trying to simulate an opening of a bascule bridge and study the flow over it in Fluent. I simplified the problem by allowing the bridge to be represented by a flat plate and I used Reynold's Number scaling to scale my dimension and wind velocity.

My objective is to create a 2D, transient, Fluent study in which the "bridge" rotates -at one end - to an angle of approximately 60 degrees.

I am having issues in creating the geometry and setting up the rotating body in fluent.

As seen in the figures below, I created an enclosure with a velocity inlet (left) and a pressure outlet (right). I used boolean to subtract the rotating body from the enclosure and another boolean to subtract the plate from the rotating body. I then used mesh motion in fluent to rotate the rotating body about it's center. The problem I am having is the fact that this geometry does not relate to the physical situation. More specifically, the roadway has to extend further into the rotating body and up to the beginning of the bridge so that the flow does not travel underneath the bridge. But because of the boolean, that portion of the roadway gets removed. I tried to solve this by removing one of the booleans and re-running the simulation, however, the flow would just go through the plate as if it was not even there.

Does anyone have an idea of what I can try?