Documentation du code de simulation numérique SUNFLUIDH

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===== Namelist "Field_Recording_Setup" =====

This data set allows the user 
   * to set the precision (simple or double) on the data related to the instantaneous fields, the statistical fields or specific fields defined on slices.
   * to reduce the dimension of the statistical fields in order to get a profile along a given direction. The reduction is made by space averaging over the other directions.
==== Full data set of the namelist ====

    &Field_Recording_Setup  Precision_On_Instantaneous_Fields=1 ,
                            Precision_On_Statistical_Fields= 2 ,
                            Precision_On_SpaceAveragedSlice_Fields= 1 ,
                            Precision_On_Slice_Fields= 1 , Slice_Gathering_Enabled= .false. ,
                            Time_Statistics_Enabled= .true. , 
                            Sample_Rate_For_Statistics= 1 ,
                            Statistic_Space_Average_Type= "NO_SPACE_AVERAGE" /
-----
==== Precision_On_Instantaneous_Fields ====
   * Type : Integer Value 
     * 1 : Instantaneous fields are recorded in single precision (r4).
     * 2 : Instantaneous fields are recorded in double precision (r8).
==== Precision_On_Slice_Fields ====
   * Type : Integer Value 
     * 1 : Instantaneous fields on slices are recorded in single precision (r4).
     * 2 : Instantaneous fields on slices are recorded in double precision (r8).
==== Slice_Gathering_Enabled ====
   * Type : boolean (default value : false)
     * true : When MPI domain decomposition is used, all pieces of a slice which are split on different subdomains are gathered and recorded in a same file. This option is not available when the computation is performed in MPI graphical topology.
     * false : When MPI domain decomposition is used, each piece of a slice that belongs to a specific subdomain is recorded in a separate file.

==== Precision_On_SpaceAveragedSlice_Fields ====
   * Type : Integer Value 
     * 1 : Special data (space-averaged fields on slices) are recorded in single precision (r4).
     * 2 : Special data (space-averaged fields on slices) are recorded in double precision (r8).
==== Precision_On_Statistical_Fields ====
   * Type : Integer Value 
     * 1 : Statistical fields are recorded in single precision (r4).
     * 2 : Statistical fields are recorded in double precision (r8).
==== Time_Statistics_Enabled ====
   * Type : Boolean value
     * .true. : For any quantity f, the statistical computation yields a time average field: $$ \overline{f(x,y,z)}= \frac{1}{T}\sum_{n=1}^{n=N_t} f(x_i,x_j,x_k,t_n) \Delta t$$
     * .false. : For any quantity f, the statistical computation yields a sample averafge field : $$ \overline{f(x,y,z)}= \frac{1}{N_t}\sum_{n=1}^{n=N_t} f(x_i,x_j,x_k,t_n) $$ where $N_t$ is number of instantaneous fields considered for the computation.
==== Statistic_Space_Averaged_Type ====
   * Type : characters
   * This data defines the direction(s) along which a spatial average is computed in addition of time or sample average:
     * NO_SPACE_AVERAGE : No space average is computed.
     * SPACE_AVERAGE_IJ : A space average is computed along the I & J-directions : $$ <\overline{f(x_k)}>= \frac{1}{N_i.N_j.T}\sum_{n=1}^{n=N_t}\sum_{i=1}^{i=N_i} \sum_{j=1}^{j=N_j} f(x_i,x_j,x_k,t_n) \Delta t$$ or $$ <\overline{f(x_k)}>= \frac{1}{N_i.N_j.N_t}\sum_{n=1}^{n=N_t}\sum_{i=1}^{i=N_i} \sum_{j=1}^{j=N_j} f(x_i,x_j,x_k,t_n) $$
     * SPACE_AVERAGE_IK : A space average is computed along the I & K-directions 
     * SPACE_AVERAGE_JK : A space average is computed along the J & K-directions 
     * SPACE_AVERAGE_I : A space average is computed along the I-direction : $$ <\overline{f(x_j,x_k)}>= \frac{1}{N_i.T}\sum_{n=1}^{n=N_t}\sum_{i=1}^{i=N_i} f(x_i,x_j,x_k,t_n) \Delta t$$ or $$ <\overline{f(x_j,x_k)}>= \frac{1}{N_i.N_t}\sum_{n=1}^{n=N_t}\sum_{i=1}^{i=N_i} f(x_i,x_j,x_k,t_n) $$
     * SPACE_AVERAGE_J : A space average is computed along the J-direction
     * SPACE_AVERAGE_K : A space average is computed along the K-direction