New: MOHID Water Vectorial and Angle Properties
From MohidWiki
Contents
Overview
This is a guide on configuring MOHID Water new way of defining vectorial properties. And a recall on angle properties computation.
Referentials
Input Vectorial properties in MOHID have a X (zonal component) and Y (meridian component).
Input Angle properties in MOHID in ModuleAtmosphere and ModuleWaves have nautical referential (0º is wind or wave from N towards S, 90º is from East towards West and so on).
MOHID computes fluxes using components in cell referential (aligned with U and V faces) and angles are also refered to cell trigonometric circle.
Old Way of definig vectorial properties and angle propeties
MOHID treated until now (Dez 2015) vectorial properties as two scalar properties, defined separately.
This an example of wind velocity X and wind velocity Y in Atmosphere_X.dat file until now:
<beginproperty> NAME : wind velocity X UNITS : m/s DESCRIPTION : wind velocity X INITIALIZATION_METHOD : CONSTANT DEFAULTVALUE : -1.0 REMAIN_CONSTANT : 1 OUTPUT_HDF : 0 <endproperty> <beginproperty> NAME : wind velocity Y UNITS : m/s DESCRIPTION : wind velocity Y INITIALIZATION_METHOD : CONSTANT DEFAULTVALUE : 0.0 REMAIN_CONSTANT : 1 OUTPUT_HDF : 0 <endproperty>
This approach is straightforward to implement as Module FillMatrix treats all properties the same, reads the options, fills the matrix and returns to calling modules.
However it creates one problem: how to deal with vectorial transformation from user input referential to the MOHID cell referential (if grid rotation and distortion exists).
The solution used until now was that each module would do its own transformations what could lead to conversion errors or lack of conversions.
The same issue occurs with angle properties where each module would do its own transformations what could lead to same problems.
The New Way of definig vectorial properties
The New age has arrived!
Only vectorial propeties have changed the input format. Angle properties are scalar properties so in terms of input there was no change.
In order to avoid the descentralization and repetition of the transformation process around modules, the vectorial property concept was created in Module FillMatrix.
And both vectorial and angle tranformation are made inside Module FillMatrix and the resulting matrixes returned to modules are always in MOHID cell referential.
An example of the new vectorial input is in Module Atmosphere:
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : wind velocity DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 OUTPUT_HDF : 0 <endproperty>
That replaces the two properties wind velocity X and wind velocity Y.
The keyword DEFAULTVALUE can now read two or three components (if 3D property) istead of only one as before.
What is the Input/Output conventions used by all Modules?
Basically user inputs vectorial properties in zonal/meridional components and angles in nautical referential (atmosphere and waves) and MOHID in all modules uses internaly MOHID cell referential given by Module FillMatrix (after transformation from user referential).
To write output each module call again Module FillMatrix to get the fields in user input referential. So input and output is always in the zonal/meridional components (vectorial) and angles in nautical referential (atmosphere and waves)
What vectorial properties does the new approach changes in terms of data file definition?
Module Atmosphere
- wind velocity X and wind velocity Y are now only defined by wind velocity property
Module InterfaceWaterAir
- wind stress X and wind stress Y are now only defined by wind stress property
Module Waves
- radiation stress X and radiation stress Y are now only defined by radiation stress property
What kind of input type is allowed for the new vectorial properties?
for now only constant, timeserie, ascii_file and hdf inputs are allowed. However new developments are welcome for other types of input.
How does ModuleFillMatrix now works?
Module FillMatrix now behaves similarly as before where each property could have only one field of type time serie, ascii file, hdf. Now it can have more (two in 2D properties). The Module FillMatrix searches how many components each property has and does the same old process on all of them, but saving the results in different fields (e.g. component X and Y).
The modules that ask properties fields to fillmatrix also save information in different matrixes and calls to fillmatrix are very similar as before but with one more field (the second component).
Remark
Now the keyword DEFAULTVALUE in a property can read more than one value so DO NOT add text comments or other things in the same line after the defined values
This is correct inside a 2D property:
!comments go here DEFAULTVALUE : -1.0 0.0
DEFAULTVALUE : -1.0 0.0 !this is not correct commenting and can stop the model at construction phase
Examples
Module Atmosphere wind velocity defined by ASCII grid
In case of ascii grid the user needs to provide two different files and two default values for x and y component (in this order).
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : wind velocity INITIALIZATION_METHOD : ASCII_FILE FILENAME_X : ..\General Data\Boundary Conditions\ASCIIGrid_-1.dat FILENAME_Y : ..\General Data\Boundary Conditions\ASCIIGrid_0.dat DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <endproperty>
Module Atmosphere wind velocity defined by time series
In case of time serie the user can
1) provide one file but two different collumns and two default values for x and y component (in this order).
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : wind velocity FILE_IN_TIME : TIMESERIE FILENAME : ..\General Data\Boundary Conditions\Velocity.srm DATA_COLUMN_X : 2 DATA_COLUMN_Y : 3 DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <endproperty>
OR 2) can provide two files and respectve collumns and two default values for x and y component (in this order).
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : wind velocity FILE_IN_TIME : TIMESERIE FILENAME_X : ..\General Data\Boundary Conditions\VelX.srm FILENAME_Y : ..\General Data\Boundary Conditions\VelY.srm DATA_COLUMN_X : 2 DATA_COLUMN_Y : 2 DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <endproperty>
Module Atmosphere wind velocity defined by HDF
In case of hdf the user can
1) provide one file but two different hdf field names and two default values for x and y component (in this order).
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : wind velocity FILE_IN_TIME : HDF FILENAME : ..\General Data\Boundary Conditions\Atmosphere_11.hdf5 HDF_FIELD_NAME_X : wind velocity X HDF_FIELD_NAME_Y : wind velocity Y DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <endproperty>
OR 2) can provide two files and respectve hdf field names and two default values for x and y component (in this order).
<beginproperty> NAME : wind velocity UNITS : m/s DESCRIPTION : solar radiation FILE_IN_TIME : HDF FILENAME_X : ..\General Data\Boundary Conditions\WindX.hdf5 FILENAME_Y : ..\General Data\Boundary Conditions\WindY.hdf5 HDF_FIELD_NAME_X : wind velocity X HDF_FIELD_NAME_Y : wind velocity Y DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <endproperty>
Module InterfaceWateAir wind stress defined to be computed
This has the same options as shown in atmosphere ones so only a block is presented to ilustrate, in this case as a computed property.
<beginproperty> NAME : wind stress UNITS : N/m2 DESCRIPTION : wind stress DEFAULTVALUE : 0.0 0.0 REMAIN_CONSTANT : 0 TIME_SERIE : 0 OUTPUT_HDF : 0 <endproperty>
Module Waves wave stress defined constant
This has the same options as shown in atmosphere ones so only a block is presented to ilustrate, in this case a constant one.
<begin_radiationstress> INITIALIZATION_METHOD : CONSTANT DEFAULTVALUE : -1.0 0.0 REMAIN_CONSTANT : 1 TIME_SERIE : 1 OUTPUT_HDF : 1 <end_radiationstress>
