Classics in CFD
- 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
- 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 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 - 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 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 - 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 - Adaptive H-Refinement on 3-D Unstructured Grids for
Transient Problems; AIAA-89-0365 (1989).
- 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/autotasking efficiency
- Basis of production codes FEFLO74, FEFLO96
- 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 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 - 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
- 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
- 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).
- 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
- 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
- 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
- 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
- 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
preconditioner) produced a very fast (parallel, vector) and robust
(RANS) solver
- 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)
- 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
- 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. 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 M. Galle - Minimization of Indirect Addressing for
Edge-Based Field Solvers; AIAA-02-0967 (2002).
- And they said it was impossible...
- 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
- 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 ?
- 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
- 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