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Transform (rotate, scale and translate) initial conditions #583

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Transform (rotate, scale and translate) initial conditions #583

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2 changes: 1 addition & 1 deletion src/TrixiParticles.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ export BoundaryMovement
export examples_dir, validation_dir, trixi_include
export trixi2vtk
export RectangularTank, RectangularShape, SphereShape
export VoxelSphere, RoundSphere, reset_wall!, extrude_geometry
export VoxelSphere, RoundSphere, reset_wall!, extrude_geometry, transform!
export SourceTermDamping
export ShepardKernelCorrection, KernelCorrection, AkinciFreeSurfaceCorrection,
GradientCorrection, BlendedGradientCorrection, MixedKernelGradientCorrection
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41 changes: 41 additions & 0 deletions src/general/initial_condition.jl
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Expand Up @@ -288,6 +288,43 @@ end

Base.intersect(initial_condition::InitialCondition) = initial_condition

function transform!(initial_condition::InitialCondition;
rotate=nothing, translate=nothing, scale=nothing)
(; coordinates) = initial_condition

NDIMS = ndims(initial_condition)

if !isnothing(rotate)
if isa(rotate, Real)
rot = rot_matrix(rotate, Val(NDIMS))
for particle in axes(coordinates, 2)
particle_position = extract_svector(coordinates, Val(NDIMS), particle)
coordinates[:, particle] = rot * particle_position
end
else
throw(ArgumentError("`rotate` must be of type `Real`"))
end
end

if !isnothing(scale)
if isa(scale, Real)
coordinates .*= scale
else
throw(ArgumentError("`scale` must be of type `Real`"))
end
end

if !isnothing(translate)
if length(translate) == NDIMS
coordinates .+= translate
else
throw(ArgumentError("`translate` must be of length $NDIMS for a $NDIMS-D problem"))
end
end

return initial_condition
end

# Find particles in `coords1` that are closer than `max_distance` to any particle in `coords2`
function find_too_close_particles(coords1, coords2, max_distance)
NDIMS = size(coords1, 1)
Expand All @@ -306,3 +343,7 @@ function find_too_close_particles(coords1, coords2, max_distance)

return result
end

rot_matrix(θ, NDIMS::Val{1}) = 0 < θ <= π ? -1 : 1
rot_matrix(θ, NDIMS::Val{2}) = @SMatrix [cos(θ) -sin(θ); sin(θ) cos(θ)]
rot_matrix(θ, NDIMS::Val{3}) = @SMatrix [cos(θ) -sin(θ) 0; sin(θ) cos(θ) 0; 0 0 1]
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