Changes between Version 449 and Version 450 of doc/app/initialization_parameters
- Timestamp:
- Dec 5, 2019 8:29:31 AM (5 years ago)
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doc/app/initialization_parameters
v449 v450 1781 1781 |---------------- 1782 1782 {{{#!td style="vertical-align:top" 1783 [=#recycling_yshift '''recycling_yshift''']1784 }}}1785 {{{#!td style="vertical-align:top"1786 I1787 }}}1788 {{{#!td style="vertical-align:top"1789 01790 }}}1791 {{{#!td1792 Parameter to define a y-shift for the recycled inflow turbulence, given in multiples of PE (may also be negative).\\\\1793 E.g. with recycling_yshift = 3 the turbulent fluctuations, obtained at the recycling plane, will be shifted by 3 processors in positive y-direction before being imposed on the inflow. This method can be used to avoid persistent streaks in the longitudinal wind component, that may form in a neutrally stratified boundary layer (detailed information about this method can be found in Munters 2016, http://www.dx.doi.org/10.1063/1.4941912). See also description of parameter [#y_shift y_shift].1794 1795 Note that '''recycling_yshift''' \= 0 requires [#turbulent_inflow turbulent_inflow] = .T..1796 }}}1797 |----------------1798 {{{#!td style="vertical-align:top"1799 1783 [=#roughness_length '''roughness_length'''] 1800 1784 }}} … … 2082 2066 This parameter introduces a shift by multiples of a subdomain size in y-direction at the left/right domain boundary. The shift is such that a point (coordinate y=yr) on the right domain boundary no longer corresponds with the point with the same y-coordinate on the left boundary, but instead with the point with the coordinate {{{y=yr+y_shift*(ny+1)/npey}}}. Conversely, a point on the left boundary with coordinate {{{y=yl}}} corresponds with the point on the right boundary with the coordinate {{{y=yl-y_shift*(ny+1)/npey}}}.\\ 2083 2067 Negative values and also those that exceed npey are allowed. They are transformed to the range {{{[0,npey-1]}}} internally.\\\\ 2084 This feature has been implemented to alleviate the occurrence of streak-like structures that appear during simulations with neutral stratification, cyclic boundary conditions, and driving velocity with no v-component. For a description of these structures, see Munters (2016; http://www.dx.doi.org/10.1063/1.4941912). See also description of parameter [#recycling_yshift recycling_yshift].\\\\\\2068 This feature has been implemented to alleviate the occurrence of streak-like structures that appear during simulations with neutral stratification, cyclic boundary conditions, and driving velocity with no v-component. For a description of these structures, see Munters (2016; http://www.dx.doi.org/10.1063/1.4941912).\\\\ 2085 2069 '''Schematic of the y_shift method:'''\\ 2086 2070 (Model domain with [../inipar#npex npex] = [../inipar#npey npey] = 5 and y_shift = 1)\\ 2087 [[Image(y_shift_pic.png,260px)]] 2088 '''In case of [../initialization_parameters#bc_lr bc_lr] = 'cyclic' and [../initialization_parameters#turbulent_inflow turbulent_inflow] = .TRUE.:'''\\ 2089 Parameter to define a y-shift for the recycled inflow turbulence, given in multiples of PE (may also be negative). 2090 E.g. with recycling_yshift = 3 the turbulent fluctuations, obtained at the recycling plane, will be shifted by 3 processors in positive y-direction before being imposed on the inflow. 2091 2071 [[Image(y_shift_pic.png,260px)]]\\\\ 2072 '''In case of [../initialization_parameters#bc_lr bc_lr] = '''dirichlet/radiation''' and [../initialization_parameters#turbulent_inflow turbulent_inflow] = .TRUE.:'''\\ 2073 Parameter to define a y-shift for the recycled inflow turbulence, given in multiples of PE. 2074 E.g. with y_shift = 3 the turbulent fluctuations, obtained at the recycling plane, will be shifted by 3 processors in positive y-direction before being imposed on the inflow. 2092 2075 }}} 2093 2076 |----------------