CFD Forum
Welcome to Autodesk’s CFD Forums. Share your knowledge, ask questions, and explore popular CFD topics.

CFD Forum

Post 1 of 2

Flow rate fluctuations incompressible

95 Views, 1 Replies
04-05-2013 08:13 AM

Is it normal to have fluctuations of the flow rate of ~2% throughout a pipe flow? I am measuring the flow rate via bulk data (plane perpendicular to flow direction). I dont have backflow, so can this error come simply due to the unstructured mesh?

Post 2 of 2

Re: Flow rate fluctuations incompressible

04-05-2013 11:13 AM in reply to: mike.h

Are you sure all the information has propogated spatially, ie. is the solution fully converged? In case of very fine mesh, it takes a while till this happens. 


Unstructured mesh does have its demonds of diffusion. Am hoping you are using second order discretization (ADV5) and if possible, extruded mesh. These should pacify diffusion and hence inaccuracy. 



Post to the Community

Have questions about Autodesk products? Ask the community.

New Post