Fluid–structure interaction analysis of the two-dimensional flag-in-wind problem by an interface-tracking ALE finite element method

SUMMARYThis contribution proposes a methodology for the numerical analysis and for the improvement of the design of free-form membrane structures subjected to flow-induced effects. Typical applications in such context are tents exposed to wind. Different physical factors connected to thin and flexible structures, highly turbulent air flows, as well as their interaction have to be taken into account. This necessitates the appropriate combination of different numerical disciplines which is done in the simulation of fluidstructure interaction. The over-all complexity of the problem favours a modular and flexible software environment with a partitioned coupling strategy. Within such an environment, the solution of each physical and algorithmic field is applicable with the most suited method. In the proposed framework, the structural field is solved with the in-house finite element program CARAT, which uses several finite element types and advanced solution strategies for form finding, nonlinear, and dynamical problems. The fluid field is solved with the CFD software package CFX-5. The interaction between both physical fields is realized by the exchange of boundary conditions. Beyond the mere exchange of data, the utilization of stabilized as well as efficient coupling strategies is mandatory. This contribution illuminates the scope of numerical simulation theory and presents implementations followed by illustrative examples.

Section: Fluid Partmentioning

confidence: 99%

A framework for stabilized partitioned analysis of thin membrane–wind interaction

Wüchner

Kupzok

Bletzinger

2007

“…This equation can be extended to the following Lagrangian description, when the interface moves under the Dirichlet boundary condition. This supposes Equation (13).…”

Section: Discretization Of Fluid Velocitiesmentioning

confidence: 99%

“…In most cases, the moving mesh approaches [3][4][5][6][7][8][9][10][11][12][13] are employed as boundary-fitted meshes generated for fitting at boundaries of structural objects or fluid domains. One of the merits of employing the interface-tracking methods is to allow the discretization of boundary conditions without inconsistent factors to physical requirements at the boundaries or interfaces.…”

Section: Introductionmentioning

confidence: 99%

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High‐order gaussian quadrature in X‐FEM with the lagrange‐multiplier for fluid–structure coupling

Sawada

Tezuka

2010

Self Cite

SUMMARYThis paper presents an alternative choice for the construction of integration cells and an additional Lagrange-multiplier mesh in computations using the eXtended finite element method (X-FEM) with the Lagrange-multiplier. The proposed computational target is flow simulations with the Dirichlet boundary conditions on a non-boundary-fitted mesh. The methods studied in this paper make use of a high-order Gaussian quadrature to relax the complexity in implementing the X-FEM with the Lagrange-multiplier. The first of these is the straightforward employment of the Gaussian quadrature as a numerical integration scheme for enriched fluid elements. The second makes use of free Lagrange-multipliers that are not placed at crossing points between fluid elements and the Dirichlet boundary. This method considers the scalability of fluid-structure and fluid-thin object interactions. A unique benchmark problem in which a computational fluid domain is partitioned into two physical domains with the Lagrange-multipliers is introduced to validate the proposed method. Numerical results show that this method is applicable in practice with acceptable numerical accuracy.

“…In these techniques, the mesh moves to follow the interface, providing the fine mesh resolution needed near the fluid-solid interface. A good number of finite element moving mesh techniques have been developed for computation of fluid-structure and fluid-particle interactions (see, for example, [12][13][14][15][16][17][18][19][20][21]). In computation of flow problems with very complex and unsteady fluid-fluid interfaces, interface-tracking techniques may require remeshing that is too frequent to be acceptable.…”

Section: Introductionmentioning

confidence: 99%

A Numerical model based on the mixed interface‐tracking/interface‐capturing technique (MITICT) for flows with fluid–solid and fluid–fluid interfaces

Cruchaga

Celentano

Tezduyar

2007

SUMMARYWe propose a numerical model for computation of flow problems that involve both fluid-solid and fluid-fluid interfaces. The model is based on the mixed interface-tracking/interface-capturing technique (MITICT), which was introduced earlier for problems that involve both fluid-solid interfaces that are accurately tracked with a moving mesh method and fluid-fluid interfaces that are too complex to track and therefore treated with an interface-capturing technique. In our numerical model, fluid-solid interfaces are handled with the moving Lagrangian interface technique (MLIT) and fluid-fluid interfaces with the edge-tracked interface locator technique (ETILT). The mixed technique is tested in computation of a fluid-particle interaction problem in the presence of a fluid-fluid interface impacted by the particle.