Changes between Version 327 and Version 328 of doc/app/initialization_parameters
- Timestamp:
- Jun 7, 2017 8:57:25 AM (8 years ago)
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doc/app/initialization_parameters
v327 v328 1300 1300 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 .\\\\ 1301 1301 In case of non-cyclic horizontal boundaries [#call_psolver_at_all_substeps call_psolver_at_all_substeps] = ''.T.'' should be used.\\\\ 1302 In case of nested run, except if [#nesting_mode nesting_mode]='' 'vertical' '', the default value of '' 'bc_lr' '' in the nest domains is not '' 'cyclic' '' but '' 'nested' '' instead. For the root domain of a nested run 1302 In case of nested run, except if [#nesting_mode nesting_mode]='' 'vertical' '', 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.\\\\ 1303 1303 '''Note:'''\\ 1304 1304 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. … … 1323 1323 In case of these non-cyclic lateral boundaries, a Dirichlet condition is used at the inflow for all quantities (initial vertical profiles - see [#initializing_actions initializing_actions] - are fixed during the run) except e, to which a Neumann (zero gradient) condition is applied. At the outflow, a radiation condition is used for all velocity components and the calculation method of the required phase velocity is controlled by the parameter [#use_cmax use_cmax]. 1324 1324 For scalars, a Neumann (zero gradient) condition is used. For the perturbation pressure, Neumann (zero gradient) conditions are assumed both at the inflow and at the outflow.\\\\ 1325 In case of nested run, except if [#nesting_mode nesting_mode]='' 'vertical' '', 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.\\\\ 1325 1326 For further details regarding non-cyclic lateral boundary conditions see [#bc_lr bc_lr]. 1326 1327 }}}