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69 results for “jedbrown”
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PSA: either #ParkMobile was hacked or they sold addresses to scammers. I use a unique email addresses and am receiving scams at the address that has only ever been used for ParkMobile. An ethical company would have notified users if they were hacked. Shame they have a monopoly.
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We're looking for new editors at @joss #JOSS_TheOJ. Come join a great community who make it possible for academic publishing to recognize the overlooked scholarship underlying so much of modern science and engineering.
https://blog.joss.theoj.org/2023/10/call-for-editors -
@[email protected] Indeed, upgrading the #RiemannSolver to #HLLC (which includes a contact wave) from #HLL (which only estimates the acoustic waves) fixes this problem. Here's a pair of oblique bubble simulations to campare HLLC (left) with HLL (right). Unlike most cases with finite volume methods (which use Riemann solvers at every grid interface), a high quality solver is important for continuous Galerkin FE boundary conditions.
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@[email protected] Indeed, upgrading the #RiemannSolver to #HLLC (which includes a contact wave) from #HLL (which only estimates the acoustic waves) fixes this problem. Here's a pair of oblique bubble simulations to campare HLLC (left) with HLL (right). Unlike most cases with finite volume methods (which use Riemann solvers at every grid interface), a high quality solver is important for continuous Galerkin FE boundary conditions.
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@[email protected] Indeed, upgrading the #RiemannSolver to #HLLC (which includes a contact wave) from #HLL (which only estimates the acoustic waves) fixes this problem. Here's a pair of oblique bubble simulations to campare HLLC (left) with HLL (right). Unlike most cases with finite volume methods (which use Riemann solvers at every grid interface), a high quality solver is important for continuous Galerkin FE boundary conditions.
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@[email protected] Indeed, upgrading the #RiemannSolver to #HLLC (which includes a contact wave) from #HLL (which only estimates the acoustic waves) fixes this problem. Here's a pair of oblique bubble simulations to campare HLLC (left) with HLL (right). Unlike most cases with finite volume methods (which use Riemann solvers at every grid interface), a high quality solver is important for continuous Galerkin FE boundary conditions.
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I'm a week late 🎃 but do any #CFD folks want to see a ghost?
One versatile technique for compressible flow is to implement "characteristic" boundary conditions by using a #RiemannSolver with a freestream solution outside. This nice paper discusses the technique and reports that HLL works as well as the more accurate solvers. But HLL doesn't represent the contact wave and fun things happen after the cold bubble reaches the outflow. https://doi.org/10.2514/6.2014-2923
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🚀 #PETSc 3.21 was released today. There were a number of new contributors this release; thank you all.
https://lists.mcs.anl.gov/pipermail/petsc-announce/2024/000115.htmlA few highlights:
* VecMDot and (optionally) VecMAXPY can identify strided memory and use gemv when applicable. This is faster than home-rolled kernels on some GPUs.
* GAMG: new filtering and smoothing options for algebraic multigrid.
* Small subdomain (many per process) BDDC support
* Trust region and quasi-Newton trust region improvements. -
@gvwilson I mention numerical/scientific software because that's the area I work in, but also, our software lifecycle is long (many packages are over 30 years old) with a cultural appetite for excusing poor user and developer experience (cf. "Firetran" https://jedbrown.org/files/BrownKnepleySmith-RuntimeExtensibilityAndLibrarizationOfSimulationSoftware-2014.pdf).
Ex: For linear algebra, #PETSc represented a radical shift from the BLAS/LAPACK philosophy at the time. But PETSc has its share of baked-in architecture, as do mature packages throughout the ecosystem.
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Now is a good time to register for #PETSc 2023 in Chicago, June 5-7.
https://petsc.org/release/community/meetings/2023/#meetingWe'd love to hear what you're doing with PETSc. Submit an abstract before May 1. https://docs.google.com/forms/d/e/1FAIpQLSesh47RGVb9YD9F1qu4obXSe1X6fn7vVmjewllePBDxBItfOw/viewform
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#PETSc 3.19 has been released. Some highlights:
* Sparse matrices have good perf w/out user-provided preallocation.
* Optimal simplex quadrature up to 20th.
* -dm_plex_shape zbox creates a "born parallel" mesh with Z-order partition.
* "Isoperiodicity": late mapping enables simple traversal of manifolds adjacent to periodic connections.
* Scalable CGNS output: high order elements and flexible batching of time series.
* Perf/GPU improvements.
* Coordinate-based SF graph. -
When does a fluids mini-app cease to be "mini"? What separates Colorful Fluid Dynamics (CFD; h/t @kpdooty) from a tool for science?
I'd argue it's when you collect turbulent statistics and get careful about statistical convergence. Our fluids mini-app was created to drive #libCEED and #PETSc library integration, but has now taken this step as it transforms into an instrument to explain how RANS models fail (and what they need to succeed). With a 10x strong scaling boost so far.
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@tgamblin @danibanez Indeed! We also have #libCEED and (partial) #PETSc bindings. @TimoBetcke is also working on Rust for scientific computing/linear algebra. And you might be interested in conversations at https://rust-scicomp.zulipchat.com/
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It's that time of year! 👀 ✨
https://jencbrown.com/2022/11/17/2022-awards-eligibility/I'm so proud of "The Probability of One," pub'd in #FantasyMagazine. It's been called mind-blowing; a wonder of a piece; folks have given it so much love!
I also rounded up other speculative projects & talks from 2022.
Please read, enjoy, and/or nominate these works, if you feel so moved. 🏆
#shortstory #BlackSpeculativeFiction #QueerSFF #SpeculativeFiction #NebulaAwards #HugoAwards #WorldFantasyAwards
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#libCEED 0.11 was released last week, providing performance-portable element algebra designed for integration in your code. These data structures move your sparse linear algebra from the dotted line to the solid line, giving a 2x performance boost even for lowest order elements (solid and fluid mechanics). This release has memory checking, backend and H(div) improvements, and various utilities, plus lots of new features in the implicit compressible viscous flow solver.
https://github.com/CEED/libCEED/releases/tag/v0.11.0 -
🚀 #PETSc 3.21 was released today. There were a number of new contributors this release; thank you all.
https://lists.mcs.anl.gov/pipermail/petsc-announce/2024/000115.htmlA few highlights:
* VecMDot and (optionally) VecMAXPY can identify strided memory and use gemv when applicable. This is faster than home-rolled kernels on some GPUs.
* GAMG: new filtering and smoothing options for algebraic multigrid.
* Small subdomain (many per process) BDDC support
* Trust region and quasi-Newton trust region improvements. -
🚀 #PETSc 3.21 was released today. There were a number of new contributors this release; thank you all.
https://lists.mcs.anl.gov/pipermail/petsc-announce/2024/000115.htmlA few highlights:
* VecMDot and (optionally) VecMAXPY can identify strided memory and use gemv when applicable. This is faster than home-rolled kernels on some GPUs.
* GAMG: new filtering and smoothing options for algebraic multigrid.
* Small subdomain (many per process) BDDC support
* Trust region and quasi-Newton trust region improvements. -
🚀 #PETSc 3.21 was released today. There were a number of new contributors this release; thank you all.
https://lists.mcs.anl.gov/pipermail/petsc-announce/2024/000115.htmlA few highlights:
* VecMDot and (optionally) VecMAXPY can identify strided memory and use gemv when applicable. This is faster than home-rolled kernels on some GPUs.
* GAMG: new filtering and smoothing options for algebraic multigrid.
* Small subdomain (many per process) BDDC support
* Trust region and quasi-Newton trust region improvements. -
🚀 #PETSc 3.21 was released today. There were a number of new contributors this release; thank you all.
https://lists.mcs.anl.gov/pipermail/petsc-announce/2024/000115.htmlA few highlights:
* VecMDot and (optionally) VecMAXPY can identify strided memory and use gemv when applicable. This is faster than home-rolled kernels on some GPUs.
* GAMG: new filtering and smoothing options for algebraic multigrid.
* Small subdomain (many per process) BDDC support
* Trust region and quasi-Newton trust region improvements. -
@gvwilson I mention numerical/scientific software because that's the area I work in, but also, our software lifecycle is long (many packages are over 30 years old) with a cultural appetite for excusing poor user and developer experience (cf. "Firetran" https://jedbrown.org/files/BrownKnepleySmith-RuntimeExtensibilityAndLibrarizationOfSimulationSoftware-2014.pdf).
Ex: For linear algebra, #PETSc represented a radical shift from the BLAS/LAPACK philosophy at the time. But PETSc has its share of baked-in architecture, as do mature packages throughout the ecosystem.
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@gvwilson I mention numerical/scientific software because that's the area I work in, but also, our software lifecycle is long (many packages are over 30 years old) with a cultural appetite for excusing poor user and developer experience (cf. "Firetran" https://jedbrown.org/files/BrownKnepleySmith-RuntimeExtensibilityAndLibrarizationOfSimulationSoftware-2014.pdf).
Ex: For linear algebra, #PETSc represented a radical shift from the BLAS/LAPACK philosophy at the time. But PETSc has its share of baked-in architecture, as do mature packages throughout the ecosystem.
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@gvwilson I mention numerical/scientific software because that's the area I work in, but also, our software lifecycle is long (many packages are over 30 years old) with a cultural appetite for excusing poor user and developer experience (cf. "Firetran" https://jedbrown.org/files/BrownKnepleySmith-RuntimeExtensibilityAndLibrarizationOfSimulationSoftware-2014.pdf).
Ex: For linear algebra, #PETSc represented a radical shift from the BLAS/LAPACK philosophy at the time. But PETSc has its share of baked-in architecture, as do mature packages throughout the ecosystem.
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@gvwilson I mention numerical/scientific software because that's the area I work in, but also, our software lifecycle is long (many packages are over 30 years old) with a cultural appetite for excusing poor user and developer experience (cf. "Firetran" https://jedbrown.org/files/BrownKnepleySmith-RuntimeExtensibilityAndLibrarizationOfSimulationSoftware-2014.pdf).
Ex: For linear algebra, #PETSc represented a radical shift from the BLAS/LAPACK philosophy at the time. But PETSc has its share of baked-in architecture, as do mature packages throughout the ecosystem.
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Now is a good time to register for #PETSc 2023 in Chicago, June 5-7.
https://petsc.org/release/community/meetings/2023/#meetingWe'd love to hear what you're doing with PETSc. Submit an abstract before May 1. https://docs.google.com/forms/d/e/1FAIpQLSesh47RGVb9YD9F1qu4obXSe1X6fn7vVmjewllePBDxBItfOw/viewform
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Now is a good time to register for #PETSc 2023 in Chicago, June 5-7.
https://petsc.org/release/community/meetings/2023/#meetingWe'd love to hear what you're doing with PETSc. Submit an abstract before May 1. https://docs.google.com/forms/d/e/1FAIpQLSesh47RGVb9YD9F1qu4obXSe1X6fn7vVmjewllePBDxBItfOw/viewform
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Now is a good time to register for #PETSc 2023 in Chicago, June 5-7.
https://petsc.org/release/community/meetings/2023/#meetingWe'd love to hear what you're doing with PETSc. Submit an abstract before May 1. https://docs.google.com/forms/d/e/1FAIpQLSesh47RGVb9YD9F1qu4obXSe1X6fn7vVmjewllePBDxBItfOw/viewform
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Now is a good time to register for #PETSc 2023 in Chicago, June 5-7.
https://petsc.org/release/community/meetings/2023/#meetingWe'd love to hear what you're doing with PETSc. Submit an abstract before May 1. https://docs.google.com/forms/d/e/1FAIpQLSesh47RGVb9YD9F1qu4obXSe1X6fn7vVmjewllePBDxBItfOw/viewform
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#PETSc 3.19 has been released. Some highlights:
* Sparse matrices have good perf w/out user-provided preallocation.
* Optimal simplex quadrature up to 20th.
* -dm_plex_shape zbox creates a "born parallel" mesh with Z-order partition.
* "Isoperiodicity": late mapping enables simple traversal of manifolds adjacent to periodic connections.
* Scalable CGNS output: high order elements and flexible batching of time series.
* Perf/GPU improvements.
* Coordinate-based SF graph. -
#PETSc 3.19 has been released. Some highlights:
* Sparse matrices have good perf w/out user-provided preallocation.
* Optimal simplex quadrature up to 20th.
* -dm_plex_shape zbox creates a "born parallel" mesh with Z-order partition.
* "Isoperiodicity": late mapping enables simple traversal of manifolds adjacent to periodic connections.
* Scalable CGNS output: high order elements and flexible batching of time series.
* Perf/GPU improvements.
* Coordinate-based SF graph. -
#PETSc 3.19 has been released. Some highlights:
* Sparse matrices have good perf w/out user-provided preallocation.
* Optimal simplex quadrature up to 20th.
* -dm_plex_shape zbox creates a "born parallel" mesh with Z-order partition.
* "Isoperiodicity": late mapping enables simple traversal of manifolds adjacent to periodic connections.
* Scalable CGNS output: high order elements and flexible batching of time series.
* Perf/GPU improvements.
* Coordinate-based SF graph.