How do you make the convergence and scaled residuals lower?
 

Hi! I'm extremely new to ANSYS Software and CFD, and I had a quick question.

I am trying to complete an assigned project and was told that my scaled residuals (convergence?) had to go down to around 1e-06 before it begins to flatten out/become horizontal. I can't seem to do this. My initial attempt flattened out between 1-e03 and 1-e04. I've made a few changes to my geometry and setup, and now it flattens out at around 1-e02, meaning my changes didn't help.

I don't know how to describe it very well, but here's the project. I have a pipe. Let's call it Pipe 1. One side of Pipe1 is the inlet and the other side is connected to a pipe of half the diameter and 1/20th of the length. Let's call this smaller pipe the ring. The other side of the ring is connected to Pipe2 which is identical to Pipe1. Pipe2 then has an outlet. I hope this is making sense. Anyways, the walls are made of steel, and the fluid within is water. I have initialized the viscuous model as laminar and set the inlet velocity to 0.001. There are around 35000 cells in the mesh if that helps by the way.

Can anyone please help?