The curvature criterion and tolerance criterion are the same as the cylindrical local mesh discussed above. All of the advanced refinement sliders are set to 1.
Both the minimum and maximum height of channel to refine are greyed out at 0 cm. the characteristic number of cells across channel to 5 and the maximum channel refinement level to 2. I put a local mesh around it and disabled solid components. As previously stated, an image that shows this volume will be linked. Its purpose is to provide a method to have the Reynolds number in the volume as a convergence criteria. I also have volume segment that I had hidden on the original image posted (as not to cause confusion).
The "close thin slots" and "display refinement level" boxes are both unchecked. The tolerance criterion is set to 0.96393 cm. The curvature criterion is set to 0.389760733 rad. The small solid feature refinement level is set to 1. The characteristic number of cells across channel is set to 5 and the maximum channel refinement level is set to 2. The "channels" check box is marked and the "number of cells" box is selected. Its level of refining fluid cells is set to 2, the level of refining cells at the fluid/solid boundary is set to 2 as well. I also have a cylindrical local mesh that encompasses the entire flow region from the outlet to the end of the red ring that lies just in front of the smallest diameter flow channel section. No other checkboxes are checked in the global mesh settings. Global mesh is of the automatic type and is set to 5 as the level of initial mesh. The turbulence parameters are the exact same as the inlet volume flow BC, and the boundary layer for this BC is also turbulent. The outlet Environment Pressure BC with X reference axis is set to 10 mmHg and 37 C. Boundary layer is set to turbulent for this BC. Turbulence Parameters for this BC are 2% turbulence intensity and 0.218037725 turbulence length. Thermodynamic parameters for this BC is 37 C. The inlet volume flow is set to a uniform 83.33333333 cm^3/s with X reference axis. The turbulence parameters were left at the default values of 2% turbulence intensity and 0.218037725 cm turbulence length. The velocity parameters in the Y and Z directions were left at the default 0 cm/s value. Note that these values were determined by using the continuity equation, since the cross-sectional area is known from the assembly geometry, and the volumetric flow rate is known from the inlet boundary condition. The velocity parameter in the X direction is set at 4 points throughout the centerline of the model (I have linked a picture with the points where the velocity is specified, the velocity values from points 1 to 4 are: The pressure is set to 12 mmHg, and the temperature is set to 37 C. The thermodynamic parameters for the initial conditions are Pressure and Temperature. The default wall thermal condition is "Adiabatic Wall." The roughness is set to 2.5 micrometer. The fluid in question is water, and the flow type is set to "Laminar and Turbulent." The "cavitation" check box is left blank. I am running an internal steady state simulation with no gravity ("Exclude cavities without flow conditions" box is not checked). The second part gives more insight into the nature of the problem I am trying to solve, and the specific issue I am running into. The first section involves specific values used to run the simulation, including initial conditions and convergence criteria. Apologies for that, and for for this long response, but I will split it into two parts. Looking back on my post, it appears that my original background text explaining the issue was not posted, and instead, only a picture was posted. Thank you very much for extending a helping hand.
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