Learning Forum

[hansenli]

I need to use LS-DYNA version 11 on supercomputer to run a few cases, and it keep return the error message:n *** Error 41434 (SOL+1434)n n Error encountered in SPH neighborhood search routine.n Please check mes#### file for detail information.nnOn workstation, the keyword file runs well in both Version 10 and Version 12, but in Version 11 it returns:nforrtl: severe (157): Program Exception - access violationnWhat might be the possible reason for this kind of error to occur? It's quite urgent.nnMany thanks.nn

[tslavik]

We recommend using the most recent release of LS-DYNA R12.0.0 since it should contain the most up-to-date fixes and features. At least on the workstation it appears to overcome the error. Please use R12.0.0 on the supercomputer, as well.nError 41434 suggests checking the messag file (for SMP) and mesXXXX files (for MPP) for more detailed information. You might find this message:nn[ from R11 and older versions ]n *** Error 40301 (SOL+301)n   SPH particle ID 137052 has more than 150 neighbors.n   Increase MEMORY in *CONTROL_SPH to 166 orn   Decrease CSLH in *SECTION_SPH.nn[ from R12 ]nNote:the terminology for MEMORY has changed to NMNEIGH in the newer release - please refer to the R12 manualhttp:/www.lstc.com/download/manualsn *** Error 40301 (SOL+301)n   SPH sort particle ID 297339n   More than 150 neighbors for the particlesn   Increase NMNEIGH_SPH or decrease the smoothing lengthnnIt is possible to retrieve more information for some error messages using the msg command on the execution line, like this:nnpath_to_your_lsdyna_executable/ls-dyna_smp_s_R12_0_0_x64_redhat65_ifort160 msg=40301nnwhich reveals:nn 1. Increase the initial number of neighbouring element per particle.  Neighbouring elements are the elements involved in the effective area and the number is defined per SPH particle  basis. Therefore, larger number results in larger memory  usage.  Please use NMNEIGH on *CONTROL_SPH to increase memory  allocation from 150 (default), to,  for example, 180 or 200 is recommended to start with.n  n 2. Decrease the constant applied to the smoothing length of  the SPH particle by CSLH on *SECTION_SPH.nnTaking a value less than 1 is inadmissible and values larger than 1.3 will increase the computational time. Please try the value smaller than 1.2. Typically, the value is above 1.05 so please start with 1.1 or 1.05.n  nAlso, HMIN/HMAX on SECTION_SPH (scale factor for min/max smoothing length) and INI on *CONTROL_SPH to change smoothing length computation method should help.n  n *** Error 40301 (SOL+301)n   SPH sort particle ID 297339n   More than 150 neighbors for the particlesn   Increase NMNEIGH_SPH or decrease the smoothing lengthn n