What does CFX account for when simulating?

Edgar Yako · April 26, 2021, 09:56

Hello,

I am curious about how CFX solves the navier-stokes equation when simulating. I understand that different methods are used to approximate it like FDM, FEM and FVM. However, in this case I am simulating a radial compressor within ANSYS and wanted to know under which scenario is the flow been simulated. In other words, is the simulation taking into account properties (apart from viscosity and incompressible flow) like Non-uniform flow path of fluid along blade passages and tip leakage?

I am asking this because I want to understand what's missing between the actual CFX simulations and real-life scenarios.

Thank you in advance
Edgar

aero_head · April 26, 2021, 15:50

Hello Edgar,

CFX is a Finite Volume Method based on Elements solver, EbFVM, with a Cell Vertex Formulation.

Each sub-volume has it own contribution evaluated. Each node will account for each sub-volume around itself and a picture of the real control volume is assembled.

The entire process uses a connectivity table as in FEM to assembling the Matrix System. Once it is done, the solver can try to find a solution.

CFX solves the balances (i.e. flux balances).

April 26, 2021, 09:56	What does CFX account for when simulating?	#1
Edgar Yako New Member Edgar Join Date: Mar 2021 Posts: 5 Rep Power: 5	Hello, I am curious about how CFX solves the navier-stokes equation when simulating. I understand that different methods are used to approximate it like FDM, FEM and FVM. However, in this case I am simulating a radial compressor within ANSYS and wanted to know under which scenario is the flow been simulated. In other words, is the simulation taking into account properties (apart from viscosity and incompressible flow) like Non-uniform flow path of fluid along blade passages and tip leakage? I am asking this because I want to understand what's missing between the actual CFX simulations and real-life scenarios. Thank you in advance Edgar

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April 26, 2021, 15:50		#2
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 9	Hello Edgar, CFX is a Finite Volume Method based on Elements solver, EbFVM, with a Cell Vertex Formulation. Each sub-volume has it own contribution evaluated. Each node will account for each sub-volume around itself and a picture of the real control volume is assembled. The entire process uses a connectivity table as in FEM to assembling the Matrix System. Once it is done, the solver can try to find a solution. CFX solves the balances (i.e. flux balances).