Re: [deal.II] SymmetricTensor rank 6 implementation issue
On 5/3/19 3:34 PM, Hamed Babaei wrote: > > I believe it will be less time-consuming if I simply avoid using the > SymmetricTensor class and use the Tensor class instead and insert the > symmetric elements manually. For sure. And for once I'm not even going to argue that this might be a nice idea to contribute a patch -- because you might be the first in approximately 15 years who has needed symmetric tensors of rank 6, and it sounds unlikely that there is a large contingent of people just waiting for this to be implemented ;-) Cheers W. -- Wolfgang Bangerth email: bange...@colostate.edu www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [deal.II] SymmetricTensor rank 6 implementation issue
Dear Wolfgang, I believe it will be less time-consuming if I simply avoid using the SymmetricTensor class and use the Tensor class instead and insert the symmetric elements manually. Thanks anyway for your incredible support! -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [deal.II] SymmetricTensor rank 6 implementation issue
On 5/3/19 2:07 PM, Hamed Babaei wrote: > > $ *SymmetricTensor<6, dim> C; * > > > The error is: > > /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:563:29: > > error: incomplete type > ‘dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ used > in nested name specifier > static const unsigned int n_independent_components > ^ > /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:1046:1: > > error: size of array is not an integral constant-expression > SymmetricTensor::SymmetricTensor (const Number () > [n_independent_components]) > ^ > /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:1046:100: > > error: size of array is not an integral constant-expression > SymmetricTensor::SymmetricTensor (const Number () > [n_independent_components]) > > > ^ > /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:861:61: > > error: invalid use of incomplete type ‘struct > dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ > typedef typename base_tensor_descriptor::base_tensor_type > base_tensor_type; > ^ > /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:188:12: > > error: declaration of ‘struct > dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ > struct StorageType; > ^ > > It seems that I need to specify n_independent_components, but I do not know > how and where I can do so. > > I appreciate it if you could give me any clue how to implement a rank-6 > tensor > successfully. Rank-6 are not currently implemented. The pieces that relate to storage are not available right now, and may other things as well. The way you define the symmetry of the tensors implies that you are thinking of a rank-6 tensor in a way so that it could be stored as a symmetric dxd matrix in which each element is a dxdxd tensor. This is consistent with a rank-2 symmetric tensor being a symmetric matrix of numbers (rank-0 tensors), and a rank-4 symmetric tensor as a symmetric matrix in which each element is a dxd (rank-2) tensor. You will want to go through the implementation in the file and see which parts are missing for your case. In particular, we are missing how the base_tensor_type needs to be defined. It should not be very difficult for you to implement this if you want to! As always, we're there to help! Best Wolfgang -- Wolfgang Bangerth email: bange...@colostate.edu www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[deal.II] SymmetricTensor rank 6 implementation issue
Hello, I am planning to use a symmetric tensor rank-6 for third-order elastic constants in a nonlinear elasticity code. The tensor is supposed to be symmetric within each three pair indices as well as all possible orders of pair permutations. Namely, C_ijklmn = C_jiklmn = C_ijlkmn = C_ijklnm = C_klijmn = C_mnijkl ,.This tensor without any material symmetry will have 56 independent elements. The SymmetricTensor class provides the symmetry within the pairs without the symmetry obtained by permutation of pairs and it will be totally fine and I can take care of the extra symmetry I need by writing the equal elements as many times as required. However, the problem is that I can not even initialize a rank-6 tensor. Interestingly it works for rank-4 though. It seems that I am missing something in the instruction of the tensor. Only the following simplest line of code gives me an error. $ *SymmetricTensor<6, dim> C; * The error is: /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:563:29: error: incomplete type ‘dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ used in nested name specifier static const unsigned int n_independent_components ^ /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:1046:1: error: size of array is not an integral constant-expression SymmetricTensor::SymmetricTensor (const Number () [n_independent_components]) ^ /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:1046:100: error: size of array is not an integral constant-expression SymmetricTensor::SymmetricTensor (const Number () [n_independent_components]) ^ /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:861:61: error: invalid use of incomplete type ‘struct dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ typedef typename base_tensor_descriptor::base_tensor_type base_tensor_type; ^ /home/hbabaei/deal.ii-candi/deal.II-v9.0.1/include/deal.II/base/symmetric_tensor.h:188:12: error: declaration of ‘struct dealii::internal::SymmetricTensorAccessors::StorageType<6, 3, double>’ struct StorageType; ^ It seems that I need to specify n_independent_components, but I do not know how and where I can do so. I appreciate it if you could give me any clue how to implement a rank-6 tensor successfully. Thanks and regards, -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
