!= Sample program for gt4_history/gt4f90io ! ! * 2007/06/25 M.Odaka ! * 2006/10/25 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_5 use gt4_history ! Access module (モジュール指定) use dc_types, only : DP ! Access module (モジュール指定) use dc_clock, only : CLOCK, Create, Close, Start, & & Stop, Result, Predict, operator(+) ! Access module (モジュール指定) integer, parameter :: nx=30 ! Grid number (グリッド数) integer, parameter :: nt=200 ! Time step number (時間ステップ数) integer, parameter :: ndisp=10 ! Output interval (出力間隔) real(DP), parameter :: dx=1.0/(nx-1) ! Grid interval (グリッド間隔) real(DP), parameter :: dt=0.0005 ! Time step (時間間隔) 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=1.0 ! Diffusion coefficient (熱拡散係数) type(CLOCK) :: clock_init, clock_loop ! Variable for CPU time counting ! CPU 時間計測用変数 call Create( clk = clock_init, & ! Initialize (初期化) & name = 'initialization' ) call Create( clk = clock_loop, & ! Initialize (初期化) & name = 'time-integration' ) call Start( clk = clock_init ) ! Start CPU time counting ! (CPU 時間計測開始) tinit = 0.0 ! Set initial time ! (初期時刻設定) temp = exp(-((x-0.5)/0.1)**2) ! Set initial value ! (初期値設定) call HistoryCreate( & ! Create output file & file='diffusion_5.nc', & ! (ヒストリー作成) & title='Diffusion equation', & & source='Sample program of gt4_history/gt4f90io', & & institution='GFD_Dennou Club davis project', & & dims=(/'x','t'/), dimsizes=(/nx,0/), & & longnames=(/'X-coordinate','time '/), & & units=(/'m','s'/), & & origin=real(tinit), interval=real(ndisp*dt) ) 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 Stop( clk = clock_init ) ! Stop CPU time counting ! (CPU 時間計測終了) do it=1,nt call Start ( clk = clock_loop ) ! Start CPU time counting ! (CPU 時間計測開始) 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(it,ndisp) == 0 ) then call HistoryPut('temp',temp) ! Output 'temp' (変数出力) endif call Stop( clk = clock_loop ) ! Stop CPU Time counting ! CPU 時間計測終了 call Predict( clk = clock_init + clock_loop, & ! Estimate remaining time & progress = real(it)/real(nt) ) ! (残り時間の予測) end do call HistoryClose call Result( clks = (/clock_init, clock_loop/), & ! Display total CPU time & total_auto = .true. ) ! (全 CPU 時間の表示) call Close( clk = clock_init ) ! Finalize (後処理) call Close( clk = clock_loop ) ! Finalize (後処理) stop end program diffusion_5