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updated warp decompose shear #117

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updated warp decompose shear #117

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65 changes: 28 additions & 37 deletions xlb/operator/collision/kbc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -186,6 +186,8 @@ def _construct_warp(self):
_u_vec = wp.vec(self.velocity_set.d, dtype=self.compute_dtype)
_f_vec = wp.vec(self.velocity_set.q, dtype=self.compute_dtype)
_epsilon = wp.constant(self.compute_dtype(self.epsilon))
_inv_four = wp.constant(self.compute_dtype(1.0)/self.compute_dtype(4.0))
_inv_six = wp.constant(self.compute_dtype(1.0)/self.compute_dtype(6.0))

@wp.func
def decompose_shear_d2q9(fneq: Any):
Expand All @@ -204,47 +206,36 @@ def decompose_shear_d2q9(fneq: Any):

# Construct functional for decomposing shear
@wp.func
def decompose_shear_d3q27(
fneq: Any,
):
# Get momentum flux
def decompose_shear_d3q27(fneq: Any):
"""Decompose shear components for D3Q27 in Warp."""
pi = self.momentum_flux.warp_functional(fneq)
nxz = pi[0] - pi[5]
nyz = pi[3] - pi[5]

# set shear components
shear1_inv6 = (_two * nxz - nyz) * _inv_six
shear2_inv6 = (-nxz + _two * nyz) * _inv_six
shear3_inv6 = (-nxz - nyz) * _inv_six
pi_invFour1 = pi[1] * _inv_four
pi_invFour2 = pi[2] * _inv_four
pi_invFour4 = pi[2] * _inv_four
s = _f_vec()

# For c = (i, 0, 0), c = (0, j, 0) and c = (0, 0, k)
two = self.compute_dtype(2.0)
four = self.compute_dtype(4.0)
six = self.compute_dtype(6.0)

s[9] = (two * nxz - nyz) / six
s[18] = (two * nxz - nyz) / six
s[3] = (-nxz + two * nyz) / six
s[6] = (-nxz + two * nyz) / six
s[1] = (-nxz - nyz) / six
s[2] = (-nxz - nyz) / six

# For c = (i, j, 0)
s[12] = pi[1] / four
s[24] = pi[1] / four
s[21] = -pi[1] / four
s[15] = -pi[1] / four

# For c = (i, 0, k)
s[10] = pi[2] / four
s[20] = pi[2] / four
s[19] = -pi[2] / four
s[11] = -pi[2] / four

# For c = (0, j, k)
s[8] = pi[4] / four
s[4] = pi[4] / four
s[7] = -pi[4] / four
s[5] = -pi[4] / four

s[9] = shear1_inv6
s[18] = shear1_inv6
s[3] = shear2_inv6
s[6] = shear2_inv6
s[1] = shear3_inv6
s[2] = shear3_inv6
s[12] = pi_invFour1
s[24] = pi_invFour1
s[21] = -pi_invFour1
s[15] = -pi_invFour1
s[10] = pi_invFour2
s[20] = pi_invFour2
s[19] = -pi_invFour2
s[11] = -pi_invFour2
s[8] = pi_invFour4
s[4] = pi_invFour4
s[7] = -pi_invFour4
s[5] = -pi_invFour4
return s

# Construct functional for computing entropic scalar product
Expand Down