Changes between Version 285 and Version 286 of doc/app/initialization_parameters
- Timestamp:
- Apr 19, 2016 2:42:37 PM (9 years ago)
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doc/app/initialization_parameters
v285 v286 1232 1232 In order to maintain a turbulent state of the flow, it may be necessary to continuously impose perturbations on the horizontal velocity field in the vicinity of the inflow throughout the whole run. This can be switched on using [../d3par#create_disturbances create_disturbances]. The horizontal range to which these perturbations are applied is controlled by the parameters [#inflow_disturbance_begin inflow_disturbance_begin] and [#inflow_disturbance_end inflow_disturbance_end]. The vertical range and the perturbation amplitude are given by [../d3par#disturbance_level_b disturbance_level_b], [../d3par#disturbance_level_t disturbance_level_t], and [../d3par#disturbance_amplitude disturbance_amplitude]. The time interval at which perturbations are to be imposed is set by [../d3par#dt_disturb dt_disturb]. Note that these inflow perturbances are added '''in addition''' to the standard perturbances that are activated with [../d3par#create_disturbances create_disturbances]. The standard perturbances can be deactivated by setting the d3par-parameter [../d3par#disturbance_energy_limit disturbance_energy_limit] = 0.0 .\\\\ 1233 1233 In case of non-cyclic horizontal boundaries [#call_psolver_at_all_substeps call_psolver_at_all_substeps] = ''.T.'' should be used.\\\\ 1234 In case of nested run ,the default value of '''bc_lr''' in the nest domains is not '' 'cyclic' '' but '' 'nested' '' instead. For the root domain of a nested run the default is '' 'cyclic' '' as usually.\\\\1234 In case of nested run the default value of '''bc_lr''' in the nest domains is not '' 'cyclic' '' but '' 'nested' '' instead. For the root domain of a nested run the default is '' 'cyclic' '' as usually.\\\\ 1235 1235 '''Note:'''\\ 1236 1236 Using non-cyclic lateral boundaries requires very sensitive adjustments of the inflow (vertical profiles) and the bottom boundary conditions, e.g. a surface heating should not be applied near the inflow boundary because this may significantly disturb the inflow. Please check the model results very carefully.