### Publication Categories

- R. Löhner, C. Othmer, M. Mrosek, A. Figueroa and A. Degro – Overnight Industrial LES for External Car Aerodynamics;
*AIAA*-2020-2031 (2020). https://doi.org/10.2514/6.2020-2031- And we got there. Key technological breakthrough: Fast and accurate Cartesian solver with embedded grid solver.

- R. Löhner – Towards Overcoming the LES Crisis;
*Int. J. of Computational Fluid Dynamics*33,3, 87-97 (2019). DOI: https://doi.org/10.1080/10618562.2019.1612052- Yes, after 20 years of waiting we are getting there.

- R. Löhner – Improved Error and Work Estimates for High Order Elements;
*Int. J. Num. Meth. Fluids*72, 11, 1207-1218 (2013).- Somewhat controversial; it will be interesting to see what happens when the dust settles and cooler heads prevail…

- R. Löhner and A. Corrigan – Semi-Automatic Porting if a General Fortran CFD Code to GPUs: The Difficult Modules;
*AIAA*-11-3219 (2011).- First large-scale production CFD code (with more than a dozen different solvers, hundreds of physics modules and more than a million lines of code) to run completely and efficiently on GPUs; key technological breakthrough: Python-based Fortran to CUDA translator

- A. Corrigan and R. Löhner – Porting of FEFLO to Multi-GPU Clusters;
*AIAA*-11-0948 (2011).

- A. Loseille and R. Löhner – Anisotropic Adaptive Simulations in Aerodynamics;
*AIAA*-10-0169 (2010).- First CFD run to compute accurately the sonic boom for an airplane flying at 11km height all the way to the ground; key elements: 3-D Euler, adaptation via local mesh modification

- Löhner, J.D. Baum, E. Mestreau, D. Sharov, C. Charman and D. Pelessone – Adaptive Embedded Unstructured Grid Methods;
*Int. J. Num. Meth. Eng.*60, 641-660 (2004).- A key idea, born in desperation (like so many), opening the way to simple embedded methods, which are now being used extensively in many fields

- O. Soto and R. Löhner – On the Computation of Flow Sensitivities From Boundary Integrals;
*AIAA*-04-0112 (2004). (pdf)- If the cost function is defined on the boundary, and only the boundary moves, why is the domain required ?

- R. Löhner – Moore’s Law and the Diminishing Importance of Parallel Computing;
*Expressions of the IACM*13, 6-8 (2003).- As scientists, we are called to describe impartially what we see

- R. Löhner and M. Galle – Minimization of Indirect Addressing for Edge-Based Field Solvers;
*AIAA*-02-0967 (2002).- And they said it was impossible…

- R. Löhner, C. Sacco, E. Onate and S. Idelsohn – A Finite Point Method for Compressible Flow;
*Int. J. Num. Meth. Eng.*53, 1765-1779 (2002).- First general FPM code for compressible code, combining: Delaunay and approximation-matrix based local cloud generation, Riemann solvers, limiters, edge-based data structures, shared-memory parallelization

- R. Löhner and E. Onate – An Advancing Point Grid Generation Technique;
*Comm. Num. Meth. Eng.*14, 1097-1108 (1998).- First general point generation technique

- R. Löhner, C. Yang and E. Onate – Viscous Free Surface Hydrodynamics Using Unstructured Grids;
*Proc. 22nd Symp. Naval Hydrodynamics*Washington, D.C., August (1998).- First detailed EULER/RANS flowfield around an armada of ships

- J.D. Baum, H. Luo and R. Löhner – The Numerical Simulation of Strongly Unsteady Flows With Hundreds of Moving Bodies;
*AIAA*-98-0788 (1998).- Never before had there been a simulation of a flowfield interacting with over 500 free-flying, contacting bodies in 3D (and comparison to experimental data)

- H. Luo, J.D. Baum and R. Löhner – A Fast, Matrix-Free Implicit Method for Compressible Flows on Unstructured Grids;
*J. Comp. Phys.*146, 664-690 (1998).- The combination of GMRES (as core solver) and LU-SGS (as pre-conditioner) produced a very fast (parallel, vector) and robust (RANS) solver

- J.D. Baum, H. Luo and R. Löhner, C. Yang, D. Pelessone and C. Charman – A Coupled Fluid/Structure Modeling of Shock Interaction with a Truck;
*AIAA*-96-0795 (1996).- Most complex real-life 3-D fluid-structure problem at the time

- J.D. Baum, H. Luo and R. Löhner – Numerical Simulation of Blast in the World Trade Center;
*AIAA*-95-0085 (1995).- Most complex 3-D transient geometry at the time
- First unstructured grid run in CFD to approach 20 Million elements

- R. deFainchtein, S.T. Zalesak, R. Löhner and D.S. Spicer – Finite Element Simulation of a Turbulent MHD System: Comparison to a Pseudo-Spectral Simulation;
*Comp.Phys.Comm.*86, 25-39 (1995).- First real-life comparison of spectral and FEM codes for turbulent flows

- A. Shostko and R. Löhner – Three-Dimensional Parallel Unstructured Grid Generation;
*Int.J.Num.Meth.Eng.*38, 905-925 (1995).- First 2-D and 3-D parallel unstructured grid generators

- J.D. Baum. H. Luo and R. Löhner – Numerical Simulation of a Blast Inside a Boeing 747;
*AIAA*-93-3091 (1993).- Most complex 3-D transient geometry at the time
- First unstructured grid run in CFD to approach 8 Million elements

- R. Löhner, J. Camberos and M. Merriam – Parallel Unstructured Grid Generation;
*Comp.Meth.Appl. Mech.Eng.*95, 343-357 (1992).

- R. Löhner and J.D. Baum – Adaptive H-Refinement on 3-D Unstructured Grids for Transient Problems;
*Int.J.Num.Meth.Fluids*14, 1407-1419 (1992).- First efficient FEM use of 3-D adaptive H-refinement for highly transient problems
- Full vectorization/auto-tasking efficiency
- Basis of production codes FEFLO74, FEFLO96

- J.D. Baum and R. Löhner – Numerical Simulation of Shock Interaction with a Modern Main Battlefield Tank;
*AIAA*-91-1666 (1991).- Most complex 3-D transient geometry at the time
- First run to demonstrate the enormous usefulness of adaptivity for 3-D transient problems
- First unstructured grid run in CFD to approach 2 Million elements

- R. Löhner – Three-Dimensional Fluid-Structure Interaction Using a Finite Element Solver and Adaptive Remeshing;
*Computer Systems in Engineering*1, 2-4, 257-272 (1990).- First demonstration of 3-D adaptive remeshing for transient problems
- Basis of production codes FEFLO52, FEFLO54, FEFLO96

- R. Löhner and J. Ambrosiano – A Vectorized Particle Tracer for Unstructured Grids;
*J.Comp.Phys.*91, 1, 22-31 (1990).- First demonstration of fast tracking for unstructured-grid PIC codes

- R. Löhner, P. Parikh and C. Gumbert – Some Algorithmic Problems of Plotting Codes for Unstructured Grids;
*AIAA*-89-1981-CP (1989).- First demonstration of fast plotting package for large 3-D unstructured grids

- Basis of plotting codes FEPLOT, FEPOST, VPLOT and NASA’s FAST

- R. Löhner – Adaptive H-Refinement on 3-D Unstructured Grids for Transient Problems;
*AIAA*-89-0365 (1989).

- R. Löhner – An Adaptive Finite Element Solver for Transient Problems with Moving Bodies;
*Comp.Struct.*30, 303-317 (1988).- First demonstration of 2-D adaptive remeshing for transient problems

- R. Löhner and P. Parikh – Three-Dimensional Grid Generation by the Advancing Front Method;
*Int.J.Num.Meth. Fluids*8, 1135-1149 (1988).- The 3-D advancing front grid generation paper
- Basis of production codes FRGEN3D and VGRID

- R. Löhner – Some Useful Data Structures for the Generation of Unstructured Grids;
*Comm.Appl.Num.Meth.*4, 123-135 (1988).- First demonstration of fast grid generation with the advancing front method

- R. Löhner, K. Morgan, J. Peraire and M. Vahdati – Finite Element Flux-Corrected Transport (FEM-FCT) for the Euler and Navier-Stokes Equations;
*Int.J.Num.Meth.Fluids*7, 1093-1109 (1987).- The FCT paper for FEMs/unstructured grids
- Basis of production codes FEFLO27, FEFLO28, FEFLO44, FEFLO64, FEFLO74, FEFLO96

- R. Löhner – An Adaptive Finite Element Scheme for Transient Problems in CFD;
*Comp.Meth.Appl.Mech.Eng.*61, 323-338 (1987).- First efficient FEM use of 2-D adaptive H-refinement for highly transient problems
- Full vectorization
- Basis of production codes FEFLO27, FEFLO28, FEFLO64

- R. Löhner, K. Morgan, J. Peraire and O.C. Zienkiewicz – Finite Element Methods for High Speed Flows;
*AIAA*-85-1531-CP (1985).- This paper put Finite Element Methods for CFD on the map