|June 7, 2016, 08:22||
Error in Drag Coefficient for 3D sphere
Join Date: Jun 2016
Posts: 17Rep Power: 2
I am analysing flow around a 3D sphere, for non-Newtonian power law fluids.
I am supposed to study the drag coefficient for various Reynolds numbers.
However, I am getting ambiguous values.
I tried the process for Newtonian fluids as well, but I'm facing the same problem there as well.
For eg., Cd for Re 30 should be around 2 for spheres, but I'm getting close to 9.
Any idea what could be going wrong?
Following are the details.
Sphere has diameter d, and is placed centrally in a cylindrical domain having dia 15d, and length 66d.
For the geometry, I made the sphere using Primitives. Froze it.
Created a circle, and it extruded to get the cylinder.
I generated the geometry, and then cut out the sphere using Body Operation.
I generated the mess, and followed Fluent solver.
Model is Viscous (laminar).
The reference values are being computed from the inlet, and Area is the (pi)(d*d)/4.
Now, this entire thing I've tried for various residuals, various fluids, and various Reynolds numbers. But my results are always wrong.
Any clue what could be happening?
|drag coefficients, error, fluent, non newtonian power law, sphere|
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