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<%
def pop_offset(i):
return i * geometry.volume
def neighbor_offset(c_i):
return {
2: lambda: c_i[1]*geometry.size_x + c_i[0],
3: lambda: c_i[2]*geometry.size_x*geometry.size_y + c_i[1]*geometry.size_x + c_i[0]
}.get(descriptor.d)()
def padding():
return {
2: lambda: 1*geometry.size_x + 1,
3: lambda: 1*geometry.size_x*geometry.size_y + 1*geometry.size_x + 1
}.get(descriptor.d)()
%>
void equilibrilize(${float_type}* f_next,
${float_type}* f_prev,
std::size_t gid)
{
${float_type}* preshifted_f_next = f_next + gid;
${float_type}* preshifted_f_prev = f_prev + gid;
% for i, w_i in enumerate(descriptor.w):
preshifted_f_next[${pop_offset(i)}] = ${w_i.evalf()};
preshifted_f_prev[${pop_offset(i)}] = ${w_i.evalf()};
% endfor
}
void collide_and_stream( ${float_type}* f_next,
const ${float_type}* f_prev,
const int* material,
std::size_t gid)
{
const int m = material[gid];
${float_type}* preshifted_f_next = f_next + gid;
const ${float_type}* preshifted_f_prev = f_prev + gid;
% for i, c_i in enumerate(descriptor.c):
const ${float_type} f_curr_${i} = preshifted_f_prev[${pop_offset(i) + neighbor_offset(-c_i)}];
% endfor
% for i, expr in enumerate(moments_subexpr):
const ${float_type} ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
${float_type} ${ccode(expr)}
% endfor
% for i, expr in enumerate(collision_subexpr):
const ${float_type} ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(collision_assignment):
const ${float_type} ${ccode(expr)}
% endfor
% for i, expr in enumerate(collision_assignment):
preshifted_f_next[${pop_offset(i)}] = m*f_next_${i} + (1.0-m)*${descriptor.w[i].evalf()};
% endfor
}
void collect_moments(const ${float_type}* f,
std::size_t gid,
${float_type}& rho,
${float_type} u[${descriptor.d}])
{
const ${float_type}* preshifted_f = f + gid;
% for i in range(0,descriptor.q):
const ${float_type} f_curr_${i} = preshifted_f[${pop_offset(i)}];
% endfor
% for i, expr in enumerate(moments_subexpr):
const ${float_type} ${expr[0]} = ${ccode(expr[1])};
% endfor
% for i, expr in enumerate(moments_assignment):
% if i == 0:
rho = ${ccode(expr.rhs)};
% else:
u[${i-1}] = ${ccode(expr.rhs)};
% endif
% endfor
}
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