세계 최강의 자유표면 수치해석 소프트웨어
2015년 FLOW-3D Korea Users Conference 발표자료를 업로드 해 드립니다.
공개 불가 자료는 올려드리지 못하오니 양해 바랍니다.
다운로드에 문제가 있으신 분들은 아래 연락처 혹은 이메일로 연락주시면 보내드리도록 하겠습니다.
-연락처 : 02-2026-0455
-이메일 : flow3d@stikorea.co.kr
다운로드 :
01_solver developments-MB
02_FLOW-3D를 이용한 등부표의 운동 모의
03_복합공진 파력발전장치의 수치실험
05_FLOW-3D 활용 사례 (관수로 및 터널 유동)_공개
06_User Interfacecs
A powerful implicit advection technique has been incorporated into FLOW-3D®, Version 9.2. This paper illustrates uses of this technique to show its advantages, but also indicates certain limitations related to the accuracy of implicit methods.
Using the implicit advection scheme requires the selection of an input parameter impadv that activates the scheme according to:
impadv = 0, no implicit advection (i.e., explicit, the default);
1, implicit advection, with limited advection at free surfaces
controlling the time-step size for accuracy;
2, implicit advection, with no advection limit on time-step size.
When using FLOW-3D® to simulate transient problems, especially those involving sharp free surfaces and/or fluid-fluid interfaces the best implicit advection option is impadv=1. In this case, the program will limit time-step size by those fluid velocities at a free surface where the velocity is normal to the surface and the fluid fraction at that location has changed by more than 5% in the preceding cycle. Otherwise, the surface velocities will not impose a limit on time-step size.
1. Introduction
A major new extension of the capabilities of FLOW-3D® — the multi-block grid model — has been incorporated into the code starting with Version 8.0. Multi-block gridding in FLOW-3D® will enable more efficient use of the software’s resources when modeling complex flow phenomena. Each block spans a certain region of the whole flow domain and contains the standard structured rectangular mesh. Two types of mesh blocks can be used: the nested blocks and the linked blocks.
Data transfer between any two mesh blocks is facilitated by special boundary (or ghost) cells. Solution quantities are interpolated from the real cells of a donor block into the boundary cells of the acceptor block. The interpolation technique varies depending on the variable at hand. Conserved quantities, like concentrations and thermal energy, are interpolated using the piecewise constant method. A special variant of this method is used for fluid fraction interpolation, where a reconstruction of the interface is performed to locate the interface within the donor cells before the interpolation.
Pressure and velocities are calculated using linear interpolation to preserve the gradients. A mixture of the Neumann- and Dirichlet-type boundary conditions is used for the solution of the Poisson equation for pressure. A weighing factor defines the contribution of each type of the boundary condition to the final solution, ensuring continuity of both pressure and velocities across the inter-block boundaries, convergence and local conservation of mass.