18.3.7. Transient Blade Row Model Parameters

Fourier Transformation
`ps max coeff loops`
Type	Integer
Default Value	3
Description	This parameter controls the maximum number of coefficient loops in the initialization and phase shifted startup cycles of the Fourier Transform model. This parameter applies only to cases that do not model any transient rotor stator interfaces using the Fourier Transform model.
`ps max coeff loops trs`
Type	Integer
Default Value	3
Description	This parameter controls the maximum number of coefficient loops in the initialization and phase shifted startup cycles of the Fourier Transform model. This parameter applies only to cases that model at least one transient rotor stator interface using the Fourier Transform model.
`ps number periodic cycles`
Type	Integer
Default Value	2
Description	Defines the number of periodic cycles of initialization of the Fourier Transform model. The purpose of the cycles is to initialize the Fourier coefficients before the start of phase shifting. The length of these cycles is the period of the disturbance being modeled. This parameter applies only to cases that do not model any transient rotor stator interfaces using the Fourier Transform model.
`ps number periodic cycles trs`
Type	Integer
Default Value	2
Description	Defines the number of periodic cycles of initialization of the Fourier Transform model. The purpose of the cycles is to initialize the Fourier coefficients before the start of phase shifting. The length of these cycles is the period of the disturbance being modeled. This parameter applies only to cases that model at least one transient rotor stator interface using the Fourier Transform model.
`ps number startup cycles`
Type	Integer
Default Value	1
Description	This parameter controls the number of phase shifted startup cycles of the Fourier Transform model. The purpose of the cycles is to limit the maximum number of coefficient loops at the start of phase shifting. The length of these cycles is the period of the disturbance being modeled. This parameter is applicable to inlet disturbance or flutter cases.
`ps reconstr mflow from sfc`
Type	Logical
Default Value	t
Description	This is a flag that controls the reconstruction of the mass flow at the pitchwise periodic interfaces from the accumulated Fourier coefficients for the Fourier Transform model. This parameter applies only to cases that do not model any transient rotor stator interfaces using the Fourier Transform model.
`ps reconstr mflow from sfc trs`
Type	Logical
Default Value	t
Description	This is a flag that controls the reconstruction of the mass flow at the pitchwise periodic interfaces from the accumulated Fourier coefficients for the Fourier Transform model. This parameter applies only to cases that model at least one transient rotor stator interface using the Fourier Transform model.
`ps relax sngl fourier coeff value`
Type	Real
Default Value	0.9
Description	This is a relaxation parameter applied to the accumulation of Fourier coefficients for the Fourier Transform model. This parameter applies only to cases that do not model any transient rotor stator interfaces using the Fourier Transform model.
`ps relax sngl fourier coeff value trs`
Type	Real
Default Value	0.9
Description	This is a relaxation parameter applied to the accumulation of Fourier coefficients for the Fourier Transform model. This parameter applies only to cases that model at least one transient rotor stator interface using the Fourier Transform model.
Harmonic Balance
`ha optimization level`
Type	Integer
Default Value	3
Description	This parameter selects between different built-in algorithms for improving the rate of solution convergence. This parameter has no effect on the results obtained for a converged solution. Set this parameter to 0 to revert to the behavior of Release 2019 R3 and earlier. Other valid values are: 1, 2, 3. If your case fails to converge, changing the value of this parameter might help.
Miscellaneous
`monitor phase shift option`
Type	Integer
Default Value	0
Description	For Transient Blade Row simulations involving the Time Transformation method or Fourier Transformation method, only a sector of the full geometry is modeled. In these cases, a stationary monitor point will, at some times, be effectively located outside of the modeled sector. During those times, monitor point input values are derived from the corresponding location within the modeled sector. Parameter `monitor phase shift option` controls how monitor point input data is derived: as a copy or as a phase-shifted copy. The default parameter value of `0` applies no special treatment for cases that use Time/Fourier transformation; monitor point input data is simply copied from the corresponding location within the modeled sector. A value of `1` takes a copy of the data and then applies a phase shift to account for solution variable variations across blade passages of the same blade row.