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LS-DYNA Vs. DYNA3D Benchmark and Validation Testing

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LS-DYNA Vs. DYNA3D Benchmark and Validation Testing RECLAMManagAingTWateIr iOn theNWest Report DSO-06-02 LS-DYNA vs. DYNA3D Benchmark and Validation Testing Dam Safety Technology Development Program U.S. Department of the Interior Bureau of Reclamation Technical Service Center Denver, Colorado December 2006 Form Approved REPORT DOCUMENTATION PAGE OMB No. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 3. DATES COVERED (From - To) 12-2006 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER LS-DYNA vs. DYNA3D—Benchmark and Validation Testing 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER O’Shea, Kevin M. 5e. TASK NUMBER 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT Bureau of Reclamation NUMBER Technical Service Center DSO-06-02 Structural Analysis Group Denver, Colorado 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR’S ACRONYM(S) Bureau of Reclamation Denver, Colorado 11. SPONSOR/MONITOR’S REPORT NUMBER(S) DSO-06-02 12. DISTRIBUTION/AVAILABILITY STATEMENT National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161 13. SUPPLEMENTARY NOTES 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION 18. NUMBER 19a. NAME OF RESPONSIBLE PERSON OF ABSTRACT OF PAGES a. REPORT b. ABSTRACT a. THIS PAGE 19b. TELEPHONE NUMBER (Include area code) Standard Form 298 (Rev. 8/98) Prescribed by ANSI Std. Z39.18 BUREAU OF RECLAMATION Technical Service Center, Denver, Colorado Structural Analysis Group, 86-68110 Report DSO-06-02 LS-DYNA vs. DYNA3D Benchmark and Validation Testing Dam Safety Technology Development Program Denver, Colorado Pre4: Kevin M. O'Shea, E.I.T. Structural Engineer, Structural Analysis Group, 86-68110 . Che2 Roman 1*. Koltuk, P.E. Structural Engineer, Structural Analysis Group, 86-68110 niuk, P.E., Structuraigineer, Structural Analysis Group, 86-68110 i/i 3/0 Larry K. Nuss, P.E. D te Structuralgineer, Structural Analysis Group, 86-68110 REVISIONS Date Description (5 - -E?i 55) o_ 0 i-< Q _____________________________________________ __________________________________ __________________________________ I Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Contents Page Program Background .............................................................................................. 1 DYNA3D .......................................................................................................... 1 LS-DYNA......................................................................................................... 2 Program Performance ............................................................................................. 2 Run Time .......................................................................................................... 2 Hourglass Control ............................................................................................. 3 User Support ..................................................................................................... 4 Preprocessing .................................................................................................... 4 Postprocessor .................................................................................................... 4 Training............................................................................................................. 5 Validation and Testing............................................................................................ 5 Parker Dam 3D Model...................................................................................... 5 Static Water Pressure .................................................................................. 5 Stress Results .............................................................................................. 6 Black Canyon Diversion Dam 2D Model......................................................... 6 Damping...................................................................................................... 6 Static Water Pressure .................................................................................. 7 Stress Results .............................................................................................. 7 Displacement............................................................................................... 7 Conclusions............................................................................................................. 8 Figures..................................................................................................................... 8 Figures No. Page 1 DYNA3D scaled displacement showing hourglassing (x 1,000). ................ 11 2 LS-DYNA scaled displacement showing hourglassing (x 1,000). ............... 11 3 DYNA3D time history stress plot................................................................. 12 4 LS-DYNA time history stress plot................................................................ 13 5 DYNA3D Parker Dam water pressure (depth = 144 ft). .............................. 14 6 LS-DYNA Parker Dam water pressure (depth = 144 ft). ............................. 15 7 DYNA3D Black Canyon Diversion Dam resulting surface motions. .......... 16 8 LS-DYNA Black Canyon Diversion Dam resulting surface motions. ......... 17 9 Element selected for water pressure plots (depth = 56.75 ft). ...................... 18 iii Dynamic Analysis of Parker Dam Using NIKE3D and LS-DYNA 10 DYNA3D Black Canyon Diversion Dam water pressure (depth = 56.75 ft)......................................................................................................... 18 11 LS-DYNA Black Canyon Diversion Dam water pressure (depth = 56.75 ft)......................................................................................................... 19 12 Nodes selected for time history of nodal displacement plots. ...................... 19 13 DYNA3D time history of nodal displacements for the 50,000-yr loading (in)................................................................................................................. 20 14 LS-DYNA time history of nodal displacements for the 50,000-yr loading (in)................................................................................................................. 20 15 Upstream face element selected for vertical stress plots. ............................. 21 16 DYNA3D vertical stresses (lb/in2) in upstream face of nonoverflow section for the 50,000-year loading........................................................................... 21 17 LS-DYNA vertical stresses (lb/in2) in upstream face of nonoverflow section for the 50,000-year loading. ............................................................. 22 18 Downstream face elements selected for vertical stress plots........................ 22 19 DYNA3D vertical stresses (lb/in2) in downstream face of nonoverflow section for the 50,000-year loading. ............................................................. 23 20 LS-DYNA vertical stresses (lb/in2) in downstream face of nonoverflow section for the 50,000-year loading. ............................................................. 23 21 LS-DYNA internal energy vs. hourglass energy ratio.................................. 24 iv Since 2002, the Bureau of Reclamation has used the explicit code DYNA3D, sometimes in conjunction with the implicit code NIKE3D, to evaluate complex three-dimensional finite element models of various dams and buildings. While in some cases the DYNA3D code worked effectively and produced quality results, it was found that in the more complex models where there are tens of thousands of elements and several complex contact surfaces, the model took days to run and its behavior/results were questionable. This led to the consideration of LS-DYNA, both an implicit and explicit code that uses the same basic theory of DYNA3D but is optimized for performance, has improved contact surface interaction, has more hourglass control options, is commercially available, has readily available technical support, and has far superior postprocessing and error checking. This report summarizes the basic results comparing program performance and stability between DYNA3D and LS-DYNA as well as the validation and benchmark testing
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