 |
 |
 |
 |
 |
 |
 |
|
|
|
|
|
|
|
The ANSYS CFX solver offers unprecedented robustness, accuracy, and computational efficiency for turbomachinery flows, based on decades of improvements and real-world turbomachinery flow simulations.
Robustness refers to the reliability of the solver to obtain a converged solution, even in adverse circumstances such as off-design flow conditions (large regions of separated flow), near stall or choke, extremely high aspect ratio meshing (to resolve boundary layer flows), poor initial conditions, highly reactive flows, cavitation, non-equilibrium situations, etc. The robustness of the ANSYS CFX solver under these conditions is one reason ANSYS CFX is so widely used for turbomachinery.
Accuracy is paramount in a turbomachinery calculation, for example in determining machine efficiency or heat transfer rates. A number of factors determine the accuracy of a simulation, the first of which is the accuracy of the numerics. The ANSYS CFX solver uses 2nd order accurate numerics by default, an industry first. A second important factor is the accuracy of the turbulence model. Almost all industrial turbomachinery flows are turbulent, and the effect of the turbulent fluctuations must be accurately yet practically modeled. CFX has a range of turbulence models offering varying degrees of turbulence model fidelity. Reynolds-averaged approaches such as the k-epsilon and Shear Stress Transport (SST) models offer excellent accuracy for minimal cost. When required, more details of the turbulence can be captured with stochastic models such as LES, DES, and SAS. ANSYS CFX also offers a revolutionary g-q predictive transition model, to predict the transition of the boundary layer flow from laminar to turbulent, an important factor in many turbomachinery flows. This combination of numerical accuracy and industry-leading turbulence modeling is a further factor making ANSYS CFX the CFD software of choice for turbomachinery.
An efficient simulation is one that is obtained quickly and reliably, even for large meshes. The CFX solver uses a variety of techniques to achieve efficient computational times, including a coupled multigrid solver for all equations, and a fully parallelized solution approach so that many computers can be applied to single flow simulation. The importance of an efficient calculation for turbomachinery analyses is a further contributing factor making ANSYS CFX the leader in this demanding field.
Courtesy HP
