Cavity Radiation Errors Requiring Recompiling

[JamesMc]

Hello all. I am running CalculiX 2.23 via PreProMax 2.5.0. I have been looking at some thermal models and I have been trying to implement the analysis of some internal cavity radiation. When enabled, the simulations would not complete. After communication over on the PrePoMax forum, I had been advised to post over here as well. As far as we could tell, this seems to be the same issue experienced on this previous thread:

*ERROR in u_calloc: error allocating memory variable=sideload

Hello, I am running into issues with memory allocations for the sideload array in ccx_2.1x.c. I have a thermal model with a mesh that contains about 160k elements with lots of surfaces for consideration of radiation and convection. Due to the high number of surfaces and subsequent uses of *FILM and *RADIATE, the _nload variable increases considerably so that the allocation NNEW macro (line 290 in ccx_2.1x.c) passes a number (variable num) to u_calloc that can not be represented via the default s…

It seems to be an integer count issue with the memory allocation with a sideload variable.

After communicating with Dr Guido Dhonte, they recommended I try to use an integer*8 version of calculix to get around this 32 bit limitation. Before I go about recompiling this myself, I wanted to check if anyone on here had already compiled a Windows Interger8 build of calculix 2.23 and was willing to share it here?

Thank you,

James Mc

[fgr]

@JamesMc You can try this one, available solvers will be Spooles & Pardiso

ccx_2.23_i8

[JamesMc]

Thank you for sharing that. I replaced my ccx_dynamic with that and did get successful, non radiation simulations. I also got successful smaller model radiations sims to work but unfortunately My larger model still wont complete running. Some further investigation required.