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Removed fixed timestep size

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This commit is contained in:
André R. Brodtkorb
2018-11-15 17:25:01 +01:00
parent ddac53271c
commit 815b4493b5
9 changed files with 79 additions and 50 deletions
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18
GPUSimulators/WAF.py
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@@ -51,7 +51,7 @@ class WAF (Simulator.BaseSimulator):
context,
h0, hu0, hv0,
nx, ny,
dx, dy, dt,
dx, dy,
g,
cfl_scale=0.9,
boundary_conditions=BoundaryCondition(),
@@ -60,10 +60,10 @@ class WAF (Simulator.BaseSimulator):
# Call super constructor
super().__init__(context,
nx, ny,
dx, dy, dt*2,
dx, dy,
cfl_scale,
block_width, block_height);
self.g = np.float32(g)
self.cfl_scale = cfl_scale
self.boundary_conditions = boundary_conditions.asCodedInt()
#Get kernels
@@ -78,7 +78,7 @@ class WAF (Simulator.BaseSimulator):
},
jit_compile_args={})
self.kernel = module.get_function("WAFKernel")
self.kernel.prepare("iiffffiiPiPiPiPiPiPi")
self.kernel.prepare("iiffffiiPiPiPiPiPiPiP")
#Create data by uploading to device
self.u0 = Common.ArakawaA2D(self.stream,
@@ -90,7 +90,10 @@ class WAF (Simulator.BaseSimulator):
2, 2,
[None, None, None])
self.cfl_data = gpuarray.GPUArray(self.grid_size, dtype=np.float32)
self.cfl_data.fill(self.dt, stream=self.stream)
dt_x = np.min(self.dx / (np.abs(hu0/h0) + np.sqrt(g*h0)))
dt_y = np.min(self.dy / (np.abs(hv0/h0) + np.sqrt(g*h0)))
dt = min(dt_x, dt_y)
self.cfl_data.fill(dt, stream=self.stream)
def step(self, dt):
self.substepDimsplit(dt*0.5, substep=0)
@@ -110,7 +113,8 @@ class WAF (Simulator.BaseSimulator):
self.u0[2].data.gpudata, self.u0[2].data.strides[0],
self.u1[0].data.gpudata, self.u1[0].data.strides[0],
self.u1[1].data.gpudata, self.u1[1].data.strides[0],
self.u1[2].data.gpudata, self.u1[2].data.strides[0])
self.u1[2].data.gpudata, self.u1[2].data.strides[0],
self.cfl_data.gpudata)
self.u0, self.u1 = self.u1, self.u0
def download(self):
@@ -122,4 +126,4 @@ class WAF (Simulator.BaseSimulator):
def computeDt(self):
max_dt = gpuarray.min(self.cfl_data, stream=self.stream).get();
return max_dt*0.5*self.cfl_scale
return max_dt*0.5