https://www.matthewliska.com/blog-1 daily 0.75 2021-07-06 https://www.matthewliska.com/blog-1/Blog Post Title One-5b7gl monthly 0.5 2020-08-27 https://www.matthewliska.com/home daily 0.75 2021-07-04 https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1565972871014-J37WVTMYBCREGI4GS0Q4/profile.jpg Home https://www.matthewliska.com/home/northeast-w6d9j monthly 0.5 2019-08-19 https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563394315349-QX8L29RKW795ZF36H3UV/Large+JPG-20130731_Trade+100_0370.jpg Home - Northeast https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407651732-R4YYGGRLATUK0VP97PXS/Large%2BJPG-20130731_Trade%2B100_0280.jpg Home - Northeast https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407767943-7SYUBNFS7ZPFD99B4Q6I/Large%2BJPG-20130731_Trade%2B100_0328.jpg Home - Northeast Lorem ipsum dolor sit amet, consectetur adipiscing. https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563993547552-1Y789O8TBYA6SGTSJJN4/20130731_Trade+100_0307.jpg Home - Northeast https://www.matthewliska.com/home/southwest-gwwcr monthly 0.5 2019-08-19 https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407279335-5NVFO4DSR8I9AFXABBES/Large%2BJPG-EmptyName%2B10.jpg Home - Southwest - Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras mattis consectetur purus sit amet fermentum. https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407320989-J7O1SKHJP1NA0LDWUNMF/Large%2BJPG-EmptyName%2B73.jpg Home - Southwest https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563387993825-5IPQFNJM3JHYFUBD62RM/Large%2BJPG-EmptyName%2B1.jpg Home - Southwest - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt. https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563387092017-7MP8U1T12V4G7X1GW8GV/Large+JPG-ishimoto1.jpg Home - Southwest https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407230192-GQHIWV8F0GL0CFLIVV4A/image-asset.octet-stream Home - Southwest https://www.matthewliska.com/home/southeast-9rssw monthly 0.5 2019-08-19 https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407530014-YX3F7FTNWK436WODV8KG/image-asset.octet-stream Home - Southeast https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1566407600630-XM5CRIP1HNV8WR84QK28/image-asset.octet-stream Home - Southeast https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563395881523-NJ41BZ9DCN5YGFLQT93V/Large+JPG-06_20160720S1_WEATHERBY_ANGLERS_219.jpg Home - Southeast https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563392823186-KP9APFP8S0UEW7CATOED/Large%2BJPG-04_20160720S1_WEATHERBY_ANGLERS_120.jpg Home - Southeast - Friends, Family, Fish. https://www.matthewliska.com/home/pacific-northwest-l5gk9 monthly 0.5 2019-08-19 https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563385479517-LKYUJ0IHUGSW6MUJHPAK/Large+JPG-ishimoto13.jpg Home - Pacific Northwest https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563386450723-VFP78VMN672NZKH456FX/Large%2BJPG-Aro%2BHa_0167.jpg Home - Pacific Northwest - Creation’s music. Photo provided by Aro Ha https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563386364934-ZOQA6GR6WKE0YP82UQRP/Large%2BJPG-landing-full-topleft-01.jpg Home - Pacific Northwest - Take only memories. Leave nothing but footprints. –Chief Seattle https://images.squarespace-cdn.com/content/v1/5d28a8672179580001e9a780/1563386618190-IZWY18O3G97YYT6P6E3A/image-asset.jpeg Home - Pacific Northwest https://www.matthewliska.com/home-1 daily 1.0 2025-04-06 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/b9746bd4-335d-4444-b599-1f72dda10eef/unnamed+%282%29.png Home https://www.matthewliska.com/home-1/project-four-zng9g monthly 0.5 2021-07-05 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625674319501-4DKYPKQWKX1MXBPODDKP/truncation+%281%29.png Home - Luminous Accretion Disks - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.matthewliska.com/home-1/project-four-zng9g-rd5bb monthly 0.5 2021-07-07 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625515376122-UKYSC0DP52P5EX9I9FMF/radiation2.png Home - H-AMR: The Next-Gen GRMHD Code - H-AMR: Radiation and Two-phase Fluids To perform simulations of radiatively cooled accretion disks, we have implemented direct radiation treatment into H-AMR. For this, we use a two-moment (M1) closure approach in the gray approximation. This means that the energy and momentum of the radiation field is able to feed back on the gas dynamics, but the spectral information is not retained. In addition, to model dilute plasmas, which are present in most accretion disks, we have implemented two-temperature fluids. We evolve the ion and electron entropy separately, calculate the total dissipation and divide that between the two species. We account for Coulomb collisions between ions and electrons through an (implicit) source term . The image on the right shows transverse slices in density, gas/radiation internal energies and electron/ion temperatures through a radiative 2T simulation of an accretion disk at 35% of the Eddington limit. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625513049022-R1UQU907QTCXXQGXHZL2/benchmark.png Home - H-AMR: The Next-Gen GRMHD Code - H-AMR: Single CPU and GPU Benchmarks H-AMR is a leader in CPU and GPU performance. It achieves 0.5 x10^6 zone cycles/s/core on a Skylake CPU in non-radiative GRMHD with full AVX-512 vectorization. On an A100 GPU H-AMR achieves 1.8x10^8 zone-cycles/s/GPU. In radiative 2T GRMHD this drops to ~1.0-3.0x10^7 zone-cycles/s/GPU depending on the complexity of the setup. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625512238884-Z1PKO8J5K2J8OOKKMYTB/Scaling.png Home - H-AMR: The Next-Gen GRMHD Code - H-AMR: Scalability on OLCF Summit H-AMR shows excellent weak scaling for both simple and complex grids. For simple grids, it shows an 80% numerical efficiency on 900 OLCF Summit nodes = 5,400 GPUs for a single block of 150x150x150 cells per GPU, without using adaptive mesh refinment (AMR) or local adaptive timestepping (LAT, dashed-dotted orange line). For more complex grids with 20 blocks of size 48x48x64 ~ 50^3 cells per GPU, the efficiency at 900 nodes drops to 60% (not shown for brevity). While using local adaptive timestepping (LAT) decreases the raw parallel efficiency to 35% (dashed green line), it also effectively speeds up the simulations by a factor of 4 (on 1 GPU) to 9 (on 5,400 GPUs, solid blue line), leading to an effective numerical efficiency of nearly 200% on 5,400 GPUs. This data is based on the largest GRMHD simulation to date, which contained ~15-20 billion cells and 85 million timesteps. It shows the ability of H-AMR to scale up under the most strenuous conditions. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625513142869-U35RKCATB0AA4VQU8U2E/grid+%281%29.png Home - H-AMR: The Next-Gen GRMHD Code - H-AMR: Treatment of Pole H-AMR efficiently and accurately handles the polar regions in a spherical grid. H-AMR achieves this by applying transmissive boundary conditions across the pole while using static mesh refinement (SMR) to avoid the squeezing of cells in the azimuthal direction, which would otherwise slow down computational speed by orders of magnitude. For this, H-AMR derefines the grid only in the troublesome azimuthal direction while maintaining the full resolution in the r- and theta-directions. This unique approach makes it possible to resolve features that pass close to the pole. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625513971839-LPC26R197K1HRCUO8W02/grid.png Home - H-AMR: The Next-Gen GRMHD Code - H-AMR: Adaptive Mesh Refinement H-AMR makes use of adaptive mesh refinement (AMR). This allows H-AMR to focus the resolution where it is most usefull as shown in the right image: Regions in the accretion disk have more blocks and thus have a higher effective resolution than regions outside of the disk. In addition. H-AMR uses a local adaptive timestep (LAT). H-AMR makes use of the fact that the grid is logarithmic spaced; e.g. the cell size increases with distance from the black hole. This makes it possible to reduce the numbers of timesteps. This leads to a factor of 3--8 speedup and increases the numerical accuracy by decreasing the noise generated due to the variable inversion (see our paper). https://www.matthewliska.com/home-1/project-four-zng9g-rd5bb-sg2ae monthly 0.5 2021-07-06 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625765515671-O86S1141ZJLAIRNG08IV/plasmoids.png Home - Accretion Disk Microphysics - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625695582577-8DG4PACHY7CV5F1LIHPM/beta.png Home - Accretion Disk Microphysics - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.matthewliska.com/home-1/project-four-zng9g-rd5bb-sg2ae-aehd5 monthly 0.5 2021-07-06 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625675017244-DX0ENV4ICYR5UR853EGD/jet_3D.png Home - Acceleration of Relativistic Jets - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.matthewliska.com/home-1/project-four-zng9g-rd5bb-sg2ae-aehd5-xz6tx monthly 0.5 2021-07-06 https://www.matthewliska.com/home-1/project-four-zng9g-rd5bb-sg2ae-aehd5-xz6tx-9ctkt monthly 0.5 2021-07-06 https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/1625600346284-7QWUCVDNYBJADANBQVR2/Rh10_Rl1_sig1000_i163_ph0_M87_Th_400_IMAGE_GRMHD_HAMR3D_plasmoid_red224_1828_226GHz.png Home - Imaging Black Holes - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/60e249f8232bdf05b2db202b/280a4159-cdc7-4707-b222-9a3b0b443aed/QPO.png Home - Imaging Black Holes - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.matthewliska.com/portfolio-1 daily 0.75 2021-07-06 https://www.matthewliska.com/portfolio-1/project-six-kw5x9 monthly 0.5 2020-05-20 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847359057-HKZQQP8MCEM0UI23R57B/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Six https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847359798-BCTJTJAS19PV54HL6VPM/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Six https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847357814-SZ205VXUQGAN268M8A18/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Six https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847356915-2V61708SR7M0A8IBEJLE/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Six https://www.matthewliska.com/portfolio-1/project-five-j7eya monthly 0.5 2020-05-20 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847350665-9UOIWAR5X24UBW83TJJO/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847351213-Z61O7XETZM827W8NSG74/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847350097-XM9U6QFAY9KBBLO1AZSP/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847349536-9B5S5JDU6CTTOIHYQPE7/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847349032-KE99W4O3PP9147GHRC10/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847348472-8QESU05NL485EPY8X8XO/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847347954-P3IYHJRVJDA9HIJAOIYW/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Five https://www.matthewliska.com/portfolio-1/project-four-wb473 monthly 0.5 2020-08-27 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847904251-HVHUK3T1H2QCY05DRHU3/image-asset.jpeg Portfolio 1 - Project Four - Make it stand out. It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847904480-AXE2TZ6WH1YWOYJELYQQ/image-asset.jpeg Portfolio 1 - Project Four - Make it stand out. It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847904674-UXDT58LZUDAEN1C4LIKQ/image-asset.jpeg Portfolio 1 - Project Four - Make it stand out. It all begins with an idea. Maybe you want to launch a business. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Whatever it is, the way you tell your story online can make all the difference. https://www.matthewliska.com/portfolio-1/project-three-nhz7c monthly 0.5 2020-05-20 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847346453-9Q5OWQYQKLUYSEI8HTQ9/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847347374-LRJZY9Z3THYAKKDMSW3J/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847345694-G1GWR6PECV9YV30U4V72/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847344987-MHQ4KNDFGIGPTF2COZ6C/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847343867-0L1OZAUWGMWQRU45XVH0/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847343275-2K532N6VSN9EQGN24WT6/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847342706-683IB8RMYZTUU4LFBADF/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Three https://www.matthewliska.com/portfolio-1/project-two-ak6ep monthly 0.5 2020-05-20 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847341420-H8BGVV7QHLUZ41NQKDDO/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847340763-INL9ICD0DK2G1M8D7C0L/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847340215-08399OG7B1B8UI9HK97O/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847339638-MF4NXTWSJ51TSBFP4AIM/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847337890-BMG68HKP3DXYMQZ6BZA6/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847337276-72BJU9SDMO608XKWX1Y0/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project Two https://www.matthewliska.com/portfolio-1/project-one-eza9s monthly 0.5 2020-05-20 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847336759-YACMFJPFHUW1OQZJXUUF/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847336169-ER4P81V0HWA3SH81W1QR/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847334968-DE82MACUOAUSEZT65M3H/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847334245-H430ILXV7TTE8OBGPEW8/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847333502-CVFRP4WIHRB50F56M888/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847332741-UB05QWW31DIDXCV1C06L/20140301_Trade-151_0124-copy.jpg Portfolio 1 - Project One