One dimensional channels are formed in the three‐dimensional open‐framework iron selenite [C4N2H12]0.5[Fe2F3(SeO3)2] (I), which was synthesized hydrothermally from FeCl3⋅6 H2O, HF, and SeO2 in the presence of the organic amine piperazine. The same inorganic framework was also obtained with the amines diethylenetetramine, 1,3‐diaminopropane, and ethylenediamine. Compound I displays unusual magnetic frustration behavior that is attributed to the tetrahedral geometry.

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The flow over multi-element airfoils has been numerically investigated in ANSYS fluent and has been compare the aerodynamic parameters with the standard NACA airfoils 4412 and 0012. The 2D viscous, transient, pressure model equations together with the k-ω turbulence model were applied to this numerical simulation utilizing the multiblock unstructured grids of sphere of influence type. Numerical results showed that the aerodynamic parameters of multi element airfoils with tail effect are much optimum than the standard NACA airfoils. Also the analysis is made on different flap and slat angles of different conditions and the optimization of multi element airfoils has been performed.

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