Numerical analysis of calcium leaching on the durability of dam concrete

Concrete dams are subjected to soft water penetration of a high water head during their long service lives. Degradation due to calcium leaching will decrease the durability of the concrete and affect dam safety. The long-term performance of concrete dams due to calcium leaching should be evaluated and predicted accurately to complete the...

Design of Deep Supported Excavations: Comparison Between Numerical and Empirical Methods

This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Peck's work (Terzaghi & Peck (1967)...

Numerical analysis of aneurysm using pulsatile blood flow through a locally expanded vessel

A numerical analysis based on a finite volume approach is employed for a 2-D axisymmetric, incompressible, laminar and transient flow in order to simulate the pulsatile blood flow in aneurysm. The unsteady nature of the blood is studied for three Womersley numbers and for three rheological models including Newtonian, Power law and Quemada. A...

Numerical Investigation of the Effect of Base Bleed on Thrust of a Truncated Aerospike Nozzle in Off-design Conditions

Aerospike nozzles are known to produce more thrust than conventional convergent-divergent nozzles in off-design conditions because of their capability to adapt their boundaries to ambient conditions. However, the central plug of an ideal aerospike nozzle can be very long and heavy, and its sharp end is susceptible to deformation in high...