!= Sample program for gtool_history/gtool5 ! ! * 2009/10/18 Y.Morikawa ! * 2003/08/21 M.Odaka ! * 2001/02/27 S.Takehiro ! ! Solving diffusion equation ! $! du/dt = \kappa d^2 u/dx^2 !$ ! for giving values of $u$ at $x=[0,1]$. ! program diffusion_cal1 use gtool_history ! Access module (モジュール指定) use dc_calendar ! Access module (モジュール指定) use dc_types ! Access module (モジュール指定) integer, parameter :: nx=30 ! Grid number (グリッド数) real(DP), parameter :: dx=1.0/(nx-1) ! Grid interval (グリッド間隔) real(DP), parameter :: dt=1. ! Time step [s] (時間間隔 [秒]) type(DC_CAL_DATE) :: start_date ! Start Date (モデル開始日時) type(DC_CAL_DATE) :: end_date ! End Date (モデル終了日時) real(DP) :: curtime ! Current time [sec] (現在時刻 [秒]) real(DP) :: endtime ! End time [sec] (終了時刻 [秒]) real(DP) :: dsptime ! Output interval [min] (出力間隔 [分]) real(DP), dimension(nx):: x=(/(dx*(i-1),i=1,nx)/) ! X coordinate (座標変数) real(DP), dimension(nx):: temp ! Temperature (温度) real(DP), parameter :: kappa=0.0001 ! Diffusion coefficient (熱拡散係数) character(256):: date_str call DCCalCreate( cal_type = 'Gregorian' ) ! Set calendar ! (暦設定) call DCCalDateCreate( year = 2009, month = 2, day = 28, & & hour = 23, min = 59, sec = 0.0_DP, & & date = start_date ) ! Set date ! (日時設定) curtime = DCCalConvertToSec( 0.0_DP, 'sec' ) ! Set initial time ! (初期時刻設定) endtime = DCCalConvertToSec( 10.0_DP, 'min' ) ! Set end time ! (終了時刻設定) dsptime = 1.0_DP ! Set output interval ! (出力間隔設定) temp = exp(-((x-0.5)/0.1)**2) ! Set initial value ! (初期値設定) call HistoryCreate( & ! Create output file & file='diffusion_cal1.nc', & ! (ヒストリー作成) & title='Diffusion equation', & & source='Sample program of gtool_history/gtool5', & & institution='GFD_Dennou Club davis project', & & dims=(/'x','t'/), dimsizes=(/nx,0/), & & longnames=(/'X-coordinate','time '/), & & units=(/'m ','min'/), & & origind=curtime, intervald=dsptime ) call HistoryPut('x',x) ! Output 'x' (次元変数出力) call HistoryAddVariable( & ! Set output variable & varname='temp', dims=(/'x','t'/), & ! (変数定義) & longname='temperature', units='K', xtype='double') call HistoryAddAttr('temp','gt_graph_tick_all',1) call HistoryAddAttr('temp','gt_graph_contour_spacing',(/0.0,1.0,0.01/)) call HistoryAddAttr('temp','+gt_user_davis_kappa',kappa) call HistoryPut('temp',temp) ! Output 'temp' (変数出力) call DCCalDateInquire( date_str, date = start_date ) ! Inquire date and set a character variable ! (日時を問い合わせて文字型変数へ代入) call HistoryAddAttr( 't', 'units', 'min since ' // trim(date_str) ) ! Output start date to a file ! (開始日時のファイルへの出力) write(6,*) "Start: ", trim(date_str) ! Display start date ! (開始日時の表示) do while ( curtime < endtime ) ! Check termination (終了判定) temp(2:nx-1) = temp(2:nx-1) & ! Time integration (時間積分) & + kappa*(temp(3:nx)-2*temp(2:nx-1)+temp(1:nx-2))/dx**2*dt if ( mod( curtime, dsptime ) == 0.0_DP ) then ! Check output timing (出力タイミング判定) call HistoryPut('temp',temp) ! Output 'temp' (変数出力) endif curtime = curtime + dt ! Progress model time (モデル時刻進行) enddo call DCCalDateInquire( date_str, curtime, start_date ) ! Inquire date and set a character variable ! (日時を問い合わせて文字型変数へ代入) write(6,*) "End: ", trim(date_str) ! Display end date (終了日時出力) call HistoryClose stop end program diffusion_cal1