Control Flags

For simulation speed purposes and comparison between an ideal instmment or a more realistic one, a series of effects within the simulator can also be activated or deactivated by the user. The current control flags are 

TmeEffects, that allows the computation of the interferograms in a way that time effects such as the drive velocity errors can be included in the simulation. DetectorEffects, to create a set of interferograms including all the detector effects (otherwise the simulator returns the raw interferograms, which is described later in this chapter). 

PointingErrors allows pointing errors to be included in the Double Fourier Modulation. 

---

Once the instrument and the sky datacube parameters have been modified according to the desired observation, the user can run FllnS. A preliminary step is to activate or deactivate the control flags. To do this, one must open FLAGS.m from Matlab or from a text editor. 

Despite the large number of control flags possible, SDG is used for relatively few purposes, each with its own requirements. It simplifies usage to predefine two or three flag collections. For example, in order of increasing potency, the three practical options used in CAMEO are tidy, redraw, and de novo ... 

Undrawable ring systems [ring systems more difficult to (re)design than the control flags permit] are transcribed to PFUs as is. 

Control flags (see preceding section on Control Flags and Preservation of... 

Because computer structural representations vary widely, different programs will have rather different ways of packaging the input. A challenge of interface design is to offer the caller an argument list that is both comprehensive and simple. The consolidation of many directives into a single variable, the control flags, represents one such measure. 

If the control flags permit, the simplest bridged ring is peeled off otherwise, the remaining ring system is labeled TOUGH CORE. 

Figure 18 Ring analysis applied to the cleanup of strychnine. Strategy depends on the control flags. Shaded areas represent unaltered rings, and ring numbers coincide with peeling order F = FUSED, B = BRIDGED, T = TOUGH CORE, C = CORE.

The turn, left or right, to be taken at each vertex except the outer two. A flag indicating whether the chain may be inverted, in case some future factor suggests it. In practice, this flag is equal to the complement of the relevant control flag (see section above on Control Flags and Preservation of Styles). 

Expression of the design mode as a bitmask of control flags (thus simplifying feature control) and introduction of numerous new control options. 

For the compressor component, compressor maps are input directly. Pressure ratio and efficiency are provided as functions of relative corrected mass flow rate (CFLO) and corrected shaft speed (CORSPD). The compressor maps are further described in Reference 12-8. The compressor model uses the default junction control flags except no choking model is applied. The compressor performance is entirely described by the compressor maps. It was judged that if the choking mode were used, choked flow might occur distorting the compressor performance. 

The model of the recuperator uses the default volume control flags except for the following 1) the vertical stratification model is not used (since not relevant to single phase flow), 2) the ORNL ANS narrow channel model heat transfer correlation Is applied, and 3) wail friction is not computed along the direction of flow. The ORNL ANS model provides the best approximation of experimental data for the low Prandtl number gas being used and the laminar flow regime. The Nusselt number from the ORNL ANS model is adjusted for both compact heat exchanger effects and Reynolds number... 

---