!= Sample program for gtool_history/gtool5 ! ! * 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_4 use gtool_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_message, only : MessageNotify ! 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) real(DP) :: sigma ! Parameter (計算安定条件パラメタ) tinit = 0.0 ! Set initial Time ! (初期時刻設定) sigma = kappa*dt/dx**2.0d0 if ( sigma >= 0.5d0 ) then call MessageNotify( "E", & ! Error mesage dump & "diffusion_4", & !(エラーメッセージ出力 ) & "dt is too large: k*dt/(dx)^2 = %f", & & d=(/sigma/) ) else if ( sigma >= 0.4d0 ) then call MessageNotify( "W", & ! Warning message dump & "diffusion_4", & ! (警告メッセージ出力) & "dt is moderately large: k*dt/(dx)^2 = %f", & & d=(/sigma/) ) else call MessageNotify( "M", & ! Message dump & "diffusion_4", & ! (メッセージ出力) & "dt is sufficiently small: k*dt/(dx)^2 = %f", & & d=(/sigma/) ) end if temp = exp(-((x-0.5)/0.1)**2) ! Set initial value ! (初期値設定) call HistoryCreate( & ! Create output file & file='diffusion_4.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','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) do it=1,nt 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 enddo call HistoryClose stop end program diffusion_4