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[Mapping] Fix shape function and equation ID evaluation for high-order NURBS in Nearest Element Mapper #14249

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Merged
juancamarotti merged 2 commits into from
Mar 4, 2026
Merged

[Mapping] Fix shape function and equation ID evaluation for high-order NURBS in Nearest Element Mapper #14249

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94456fb
solve the bug inside projection utilities (happening for p>2)
juancamarotti Mar 3, 2026
056de5d
adding a test for high order NURBS surfaces
juancamarotti Mar 4, 2026
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16 changes: 8 additions & 8 deletions applications/MappingApplication/custom_utilities/projection_utilities.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -63,17 +63,17 @@ void FillEquationIdVectorIBRA(const GeometryType::Pointer pGeometry,
{
KRATOS_TRY;
// Get the polynomial degree of the nurbs surface
IndexType polynomial_degree_u = pGeometry->PolynomialDegree(0);
IndexType polynomial_degree_v = pGeometry->PolynomialDegree(1);
const IndexType polynomial_degree_u = pGeometry->PolynomialDegree(0);
const IndexType polynomial_degree_v = pGeometry->PolynomialDegree(1);

// Get the knot vectors of the nurbs surface and extend them to be consistent
// Get the knot vectors of the nurbs surface and extend them to be consistent
std::vector<double> knot_vector_u, knot_vector_v;
pGeometry->SpansLocalSpace(knot_vector_u, 0);
pGeometry->SpansLocalSpace(knot_vector_v, 1);
knot_vector_u.insert(knot_vector_u.begin(), knot_vector_u.front());
knot_vector_u.insert(knot_vector_u.end(), knot_vector_u.back());
knot_vector_v.insert(knot_vector_v.begin(), knot_vector_v.front());
knot_vector_v.insert(knot_vector_v.end(), knot_vector_v.back());
knot_vector_u.insert(knot_vector_u.begin(), polynomial_degree_u - 1, knot_vector_u.front());
knot_vector_u.insert(knot_vector_u.end(), polynomial_degree_u - 1, knot_vector_u.back());
knot_vector_v.insert(knot_vector_v.begin(), polynomial_degree_v - 1, knot_vector_v.front());
knot_vector_v.insert(knot_vector_v.end(), polynomial_degree_v - 1, knot_vector_v.back());

// shape function container.
NurbsSurfaceShapeFunction shape_function_container(
Expand Down Expand Up @@ -450,4 +450,4 @@ bool ComputeProjection(const GeometryType& rGeometry,
}

} // namespace ProjectionUtilities
} // namespace Kratos.
} // namespace Kratos.
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