@inproceedings {Simula.simula.2460,
	title = {Effect of Oscillatory Cerebrospinal Fluid Pressure on Fluid Movement in the Spinal Cord},
	journal = {Seventh National Conference on Computational Mechanics (MekIT{\textquoteright}13)},
	year = {2013},
	publisher = {Tapir Akademisk Forlag},
	type = {Conference},
	author = {St{\o}verud, Karen-Helene and Mardal, Kent-Andre and Hans Petter {Langtangen}},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Simula.simula.638,
	title = {On the Complexity of Stationary Flow in Patient-Specific Aneurysms},
	journal = {MekIT{\textquoteright}11 Sixth national conference on Computational Mechanics},
	year = {2011},
	pages = {379-392},
	publisher = {tapir academic press},
	type = {Conference},
	abstract = {Summary Sound or bruits in the vasculatory system at the range of 1Hz-1kHz is known to occur, and frequency peaks at high frequencies are associated with sick blood vessels. The exact reason for these sounds are not known, but the sound may be generated by turbulence. Turbulence generated sound is typically associated with high frequencies but also with low energy levels. Unfortunately, most blood flow simulations are performed with space and time resolutions where rapid fluctuations typ- ically associated with non-laminar flow cannot be captured. Complex non-laminar flow and the subsequent oscillatory wall stresses can po- tentially be of importance in understanding aneurysm rupture through the local arterial wall response. To investigate the possible presence of complex non-laminar blood flow in intracranial aneurysms, we per- formed high resolution computational fluid dynamics (CFD) simulations for patient specific middle cerebral artery (MCA) aneurysms with sta- tionary inflow conditions. The current study confirms, through high resolution simulations, that complex oscillatory flow may occur in in- tracranial aneurysms. CFD practitioners should therefore be aware of the potentially strong demands to space-time computational resolution in blood flow simulations.},
	isbn = {978-82-519-2798-7},
	author = {Valen-Sendstad, Kristian and Mardal, Kent-Andre and Mortensen, Mikael and Bj{\o}rn Anders Petterson {Reif} and Hans Petter {Langtangen}},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Staff.2005.1,
	title = {The Accuracy of the Velocity Approximation With Respect to the Pressure Approximation for Incompressible Fluid Flow},
	journal = {Third National Conference on Computational Mechanics (MekIT 05)},
	year = {2005},
	month = {May},
	pages = {297-311},
	publisher = {Tapir Academic Press},
	type = {1},
	edition = {first},
	address = {Trondheim, May 11-12},
	abstract = {We consider the accuracy of the velocity approximation with respect to the pressure approximation using various standard finite element methods for incompressible fluid flow. Of particular interest is the case where the hydrostatic part of the pressure is dominating, which implies that the pressure may be large relative to the velocity. Some standard mixed elements like the Mini element and the Taylor-Hood element handle this case well, while others like the P\_2-P\_0 element and the Crouzeix-Raviart element do not. This seems to be related to the fact that the Taylor-Hood and the Mini elements yield a stable approximation of the mixed Poisson problem.},
	author = {Gunnar Andreas {Staff} and Mardal, Kent-Andre},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Linge.2005.2,
	title = {Biology and Modelling of Cardiovascular Tissue Dynamics},
	journal = {Third National Conference on Computational Mechanics (MekIT 05)},
	year = {2005},
	month = {May},
	pages = {211-225},
	publisher = {Tapir Academic Press},
	type = {1},
	address = {Trondheim, Norway May 11-12},
	abstract = {It is well known that shape and function of heart and blood vessels are influenced by blood flow and pressure. The heart muscle grows to cope with the demands of a sportsman, the inner diameter of vessels increases with increased shear stress from blood flow, and vessel walls themselves get thicker with elevated blood pressure. Such effects are observed in healthy people with varying activity levels, and also in patients with different malfunctions. Modelling and simulating the function and the adaptation of heart and blood vessels to mechanical load is needed to fully understand the complex relations involved. A thorough understanding of these mechanisms is fundamental for good patient diagnosis and treatment planning. Also, simulations will reduce the need for time consuming and stressful invasive measurements. In this brief review, we present some of the relevant biology, and address important modelling approaches of cardiovascular functioning and adaptation.},
	author = {Linge, Svein},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Thorvaldsen.2005.2,
	title = {A Mixed Formulation for Modeling the Mechanical Bahavior of the Heart},
	journal = {MekIt05 - Third national conference om Computational Mechanics, Trondheim May 11-12},
	year = {2005},
	month = {May},
	pages = {327-341},
	publisher = {Tapir Academic Press},
	type = {1},
	abstract = {In this paper we present a mixed finite element formulation for modeling the mechanical behavior of the cardiac tissue. The modeling may be divided into a passive and an active part. The passive properties are in this work described by a transversely isotropic, hyperelastic material model. Moreover, the myocardium is assumed to be almost incompressible. In advanced models the active contraction is strongly connected to electro-physiological processes in the muscle cells. In this paper we simplify the active stress contribution by modeling it as a linear function in time. Due to the fact that the heart muscle undergoes large deformations during contraction, both material and geometrical non-linearities must be taken into account in the analysis. Numerical results are presented for different activation patterns applied to a box-shaped test specimen, which represents a piece of the myocardial wall. The proposed mixed method offers reasonable results in the modeling of the mechanical behavior of the test specimen.},
	author = {Thorvaldsen, Tom and Sundnes, Joakim and Osnes, Harald},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Hanslien.2005.2,
	title = {Numerical Simulations of Cardiac Arrhythmias and Defibrillation},
	journal = {MekIT{\textquoteright}05 - Third national conference on Computational Mechanics, Trondheim, Norway May 11-12},
	year = {2005},
	pages = {135-144},
	publisher = {Tapir Academic Press},
	type = {1},
	address = {Trondheim},
	isbn = {82-519-2052-3},
	author = {Hanslien, Monica and Sundnes, Joakim and Glenn T. {Lines}},
	editor = {Bj{\o}rn H. {Skallerud} and Helge I. {Andersson}}
}
@inproceedings {Staff.2005.2,
	title = {Preconditioning of Fully Implicit Runge-Kutta Schemes for Parabolic PDEs},
	journal = {SIMS05. 46th Conference on Simulation and Modeling, Trondheim, October 13-14},
	year = {2005},
	pages = {315-324},
	publisher = {Tapir Academic Press},
	type = {1},
	abstract = {Recently, the authors introduced a preconditioner for the linear systems that arise from fully implicit Runge-Kutta time stepping schemes applied to parabolic PDEs \cite{mns}. The preconditioner was a block Jacobi preconditioner, where each of the blocks were based on standard preconditioners for low-order time discretizations like implicit Euler or Crank-Nicolson. It was proven that the preconditioner is optimal with respect to the timestep and the discretization parameter in space. In this paper we will improve the convergence by considering other preconditio ners like the upper and the lower block Gauss-Seidel preconditioners, both in a left and right preconditioning setting . Finally, we improve the condition number by using a generalized Gauss-Seidel p reconditioner.},
	author = {Gunnar Andreas {Staff} and Mardal, Kent-Andre and Nilssen, Trygve Kastberg},
	editor = {Amundsen, J{\o}rn and Helge I. {Andersson} and Celledoni, Elena and Gravdahl, Tommy and Finn A. {Michelsen} and Henrik R. {Nagel} and Natvig, Thorvald}
}
