Parametric Positioning for Analysis Surfaces in Turbomachine Domains
In studies of cases of revolving volumes, such as turbomachinery, a typical requirement for post-processing is to render and plot data on surfaces or profiles that are positioned parametrically in relation to the domain bounding surfaces. For example, you may wish to view the total pressure on a surface located exactly half-way between the hub and shroud, or you may wish to plot pressure across both blade surfaces on a given slice.
In Simcenter STAR-CCM+, parameterizations are objects that you create in order to achieve parametric positioning within a turbomachinery domain. Each parameterization generates a set of field functions that you use in creating derived part surfaces or profiles whose location is determined parametrically. You can then use these parametrically-defined derived parts or profiles in scenes and plots.
- Axisymmetric: interpolates the whole domain according to meridional, spanwise, and circumferential directions. See Axisymmetric Parameterization.
- Blade: interpolates one or more blades according to root and tip or leading and trailing edges. See Blade Parameterization.
Axisymmetric Parameterization
In Simcenter STAR-CCM+, parametric coordinates can be computed for turbomachinery domains that are solids of revolution and are axisymmetric. Since the system is axisymmetric it has an underlying cylindrical coordinate system. The parameter space has the following three directions:
- Meridional or streamwise direction—spans from the inlet of the domain to the outlet, roughly in the axial direction of the underlying cylindrical coordinate system.
- Spanwise direction—spans from the interior domain bounding surface (hub) to the exterior domain bounding surface (shroud), roughly in the radial direction of the cylindrical coordinate system.
- Circumferential—rotates around the axis of symmetry of the cylindrical coordinate system. In this release, no parameteric coordinates are computed for the circumferential direction.
The field functions generated by an axisymmetric parameterization are listed within Parameterization Field Functions.
In addition to the field functions, an axisymmetric parameterization creates an axisymetric embedding transform (conformal) that you can use in scenes for visualization.
Blade Parameterization
A blade parameterization provides parametric positioning for the blade surface. The parametrization is from -1 to +1 over the blade side surfaces (trailing edge → suction side → leading edge → pressure side → trailing edge), and from 0 to 1 across the blade width (root curve → tip curve).
The blade parameterization allows you to create plots of blade loading that show both the suction side and the pressure side in a single unwrapped plot. Using its associated transform, the blade parameterization also allows you to create scalar surface contour plots that show the unwrapped 2D surface of the blade.
Simcenter STAR-CCM+ lets you create a blade parameterization for one blade or multiple blades. The field functions generated by a blade parameterization are listed within Parameterization Field Functions.