[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] Short communication

[en] The stochastic model of tracer flow through porous medium is presented. The model includes the finite flow velocity of the tracer particles. The tracer concentration at a given time-and-space point is to be understood as a tracer concentration in the flowing water - just being measurable (the model takes, into account the presence of stagnant water). The model satisfies the law of fluid continuity. V₂ approaching V₁, the model converges to the ''piston-flow'' model. The model describes dispersion phenomenon and satisfies the tracer conservation law. The model may be applied to: determination of the mean residence time of water in the hydrological system, calculation of parameters of porous medicum estimation based on experiments with natural tracers, interpretation of the curves of the traces flow through two adjacent aquifers having different velocities of filtration. (Z.M.)

[en] Short communication

[en] The SPACE code offers several options for critical flow model. One of the option is Henry/Fauske-Moody model. When using this model, Henry-Fauske critical flow model is used for single phase liquid and Moody model is used for 2-phase flow. For Henry-Fauske model, SPACE code assumes non-equilibrium (NE) factor of 0.14. In previous OPRlO00 SBLOCA analysis methodology based on RELAPS code, non-equilibrium factor of 1.0 was used to get more conservative break flow. To develop SBLOCA analysis methodology for OPRlO00 using SPACE code, it was necessary to use different non-equilibrium factor from SPACE default values for Henry-Fauske model. The SPACE code was improved by adding additional option for Henry/Moody-Moody model, which uses user input non-equilibrium factor. To accept user input equilibrium factor, the SPACE code is improved by expanding lookup table used in Henry/Fauske-Moody model. To verify the new model, we perform verification calculations on LOFT L9-3 which is a represenrative integral effect test (IET).

[en] In this paper, we present some results from our three-dimensional, non-hydrostatic, finite element model applied to simulations of flow in Brush Creek Valley. These simulations are not intended to reproduce any particular experiment, but rather are to evaluate the qualitative performance of the model, to explore the major difficulties involved, and to begin sensitivity studies of the flows of interest. 2 refs., 11 figs