Search results for "virtaus"

Puukuitususpension putkistovirtaus, viskositeetti ja häviökorrelaatiomalli

2010

We measured pressure loss and velocity profile from pine and birch suspension flow in two straight PVC-tubes. The suspension consistencies were 0,5 %–4,0 % and tubes' radius were 105,2 mm and 191,6 mm. The velocity profiles were measured with pulsed ultrasonic Doppler velocimetry technique. Unusual laminar shaped profiles were discovered at low flow rates of birch suspension. With these profiles it was possible to calculate the actual viscosity for fiber suspension. In the analysis we discovered that the viscosity didn't depend on the flow velocity or geometry. It was possible to write a material law that describes the viscosity as a function of shear rate with two material related paramete…

Kirjolohen (Oncorhynchus mykiss) kasvun, eväindeksien muutosten ja kuolleisuuden vertailu kiertovesi- ja läpivirtaussysteemeissä

2008

Dehydraation vaikutus albumiinin poistumisnopeuteen luurankolihaksesta kuormituksen aikana

1998

Designing a graphics processing unit accelerated petaflop capable lattice Boltzmann solver: Read aligned data layouts and asynchronous communication

2017

The lattice Boltzmann method is a well-established numerical approach for complex fluid flow simulations. Recently, general-purpose graphics processing units (GPUs) have become available as high-performance computing resources at large scale. We report on designing and implementing a lattice Boltzmann solver for multi-GPU systems that achieves 1.79 PFLOPS performance on 16,384 GPUs. To achieve this performance, we introduce a GPU compatible version of the so-called bundle data layout and eliminate the halo sites in order to improve data access alignment. Furthermore, we make use of the possibility to overlap data transfer between the host central processing unit and the device GPU with comp…

Navier-Stokes equations

2009

A graph-based multigrid with applications

2010

A posteriori error estimates for variational problems in the theory of viscous fluids

2016

The papers included in the thesis are focused on functional type a posteriori error estimates for the Stokes problem, the Stokes problem with friction type boundary conditions, the Oseen problem, and the anti-plane Bingham problem. In the summary of the thesis we consider only the Oseen problem. The papers present and justify special forms of these estimates which are suitable for the approximations generated by the Uzawa algorithm. The estimates are of two main types. Estimates of the first type use exact solutions obtained on the steps of the Uzawa algorithm. They show how errors encompassed in Uzawa approximations behave and have mainly theoretical meaning. Estimates of the second type o…

Puukuitususpension putkivirtauksen virtausprofiilin symmetrisyys ja sen turbulenttisen alueen mallintaminen

2007

T cell differentiation by human parvovirus B19 non-structural protein 1 induced apoptotic bodies

2015

Uutta tietoa ihmisen immuunijärjestelmästä ja sen toiminnasta kerätään jatkuvasti. Synnynnäinen ja hankittu immunijärjestelmä toimivat yhteistyössä erilaisia patogeeneja vastaan. Dendriittisolut toimivat siltana synnynnäisen ja hankitun vastustuskyvyn välillä stimuloimalla T ja B lymfosyyttejä. Antigeenin esittely luokan II MHC molekyylin (eng. major histocompatibility complex) ja T solun reseptorin (TCR) välillä, sekä erillisen reseptorin ja ligandin tai sytokiini -signaalin välityksellä, CD4+ T solut stimuloituvat ja erilaistuvat. Erilaistuneita CD4+ T auttajasoluja (Th, eng. T helper cell) on eri alalajeja, jotka osallistuvat vaihtelevasti immuunipuolustukseen, esimerkiksi suojana erilai…

Simulations of the structure and rheology of wet webs

2009

In this Thesis we modified a recently introduced model for fiber suspensions to be applicable to wet fiber networks so as to analyze by computer simulations their structural and rheological properties. These properties were compared, under tensile loading in particular, to those of wet and dry paper. The model used operated at the fiber level, where the dynamics of fiber motion were determined by fiber stiffness and fiber-fiber interactions such as friction and adhesive forces. Water surface tension, inter-fiber contact area, and moisture content all contributed to the latter force. The tensile strength of wet fiber networks could be described in terms of a very simple function of adhesion-…