Vicente Mataix Ferrándiz

[Core][Test] Moving testing files consistently

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**📝 Description** This PR moves the testing files to the testing folder, for the sake of consistency **🆕 Changelog** - This PR moves the testing files to the testing folder...

**📝 Description** Moving mdpa consistent folder **🆕 Changelog** - Moving mdpa consistent folder

[Core] Extend modelpart utilities

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**Description** Adding methods to add elements/conditions with its nodes **Changelog** - Adding methods to add elements/conditions with its nodes - Tests added

[Core] Consistency between Element/Condition and Node clone

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The clone of the node does not consider new Id: https://github.com/KratosMultiphysics/Kratos/blob/fbb7be7bcf6c1b6c5c5cd2233488cf382816adcd/kratos/includes/node.h#L328 But the condition and element does: https://github.com/KratosMultiphysics/Kratos/blob/231a4d1451377b593791cc330ec1a052a1594ea0/kratos/includes/element.h#L233 Maybe we should discuss this inconsistency

[Core] Adding SetStiffnessMatrixIsBuilt and GetStiffnessMatrixIsBuilt to ImplicitSolvingStrategy

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**📝 Description** Adding SetStiffnessMatrixIsBuilt and GetStiffnessMatrixIsBuilt to ImplicitSolvingStrategy Fixes https://github.com/KratosMultiphysics/Kratos/issues/10109 **🆕 Changelog** - Adding SetStiffnessMatrixIsBuilt and GetStiffnessMatrixIsBuilt to ImplicitSolvingStrategy - Moving build level methods to Access category

[Question] What is kratos_space.h?

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**Description** Today I realized that we have an implementation (newer and using parallel utilities instead of plain OMP) called `kratos_space.h`: https://github.com/KratosMultiphysics/Kratos/blob/master/kratos/spaces/kratos_space.h But this implementation is only used in the corresponding...

[EVERYONE] Please check your stale branches

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 We reached 518 branches, can @KratosMultiphysics/all please check their respective stale branches? This is reminder of #1350 #2132 and #3167 [All stale]( https://github.com/KratosMultiphysics/Kratos/branches/stale) [Yours]( https://github.com/KratosMultiphysics/Kratos/branches/yours)

**📝 Description** This bug was found by @pablobecker. When using the elimination builder and solver, if the contribution of the element is zero there is no check that there is...

[StructuralMechanicsApplication] Fix Lumped factors in Massmatrix for solids

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**Description** Fix #8457. Computes just once the lumping factors. NOTE: I think that this could be an issue with imposed displacement, in any case the lumping factors can still be...

[Discussion] How to reduce size of MDPA files?

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**Description** Right now MDPA are human readable, which is a huge advantage. But they have a main disavantage, these files are huge, specially with complex submodelparts structure. Due to this,...