Changes between Version 449 and Version 450 of doc/app/initialization_parameters


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Timestamp:
Dec 5, 2019 8:29:31 AM (5 years ago)
Author:
oliver.maas
Comment:

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  • doc/app/initialization_parameters

    v449 v450  
    17811781|----------------
    17821782{{{#!td style="vertical-align:top"
    1783 [=#recycling_yshift '''recycling_yshift''']
    1784 }}}
    1785 {{{#!td style="vertical-align:top"
    1786 I
    1787 }}}
    1788 {{{#!td style="vertical-align:top"
    1789 0
    1790 }}}
    1791 {{{#!td
    1792 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"
    17991783[=#roughness_length '''roughness_length''']
    18001784}}}
     
    20822066This 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}}}.\\
    20832067Negative 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].\\\\\\
     2068This 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).\\\\
    20852069'''Schematic of the y_shift method:'''\\
    20862070(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.:'''\\
     2073Parameter to define a y-shift for the recycled inflow turbulence, given in multiples of PE.
     2074E.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.
    20922075}}}
    20932076|----------------