By ZhiJunt S., GuangWei Y., JingYan Y.

A brand new Lagrangian cell-centered scheme for two-dimensional compressible flows in planar geometry is proposed by means of Maire et al. the most new characteristic of the set of rules is that the vertex velocities and the numerical puxes in the course of the phone interfaces are all evaluated in a coherent demeanour opposite to plain techniques. during this paper the tactic brought via Maire et al. is prolonged for the equations of Lagrangian gasoline dynamics in cylindrical symmetry. diversified schemes are proposed, whose distinction is that one makes use of quantity weighting and the opposite sector weighting within the discretization of the momentum equation. within the either schemes the conservation of overall power is ensured, and the nodal solver is followed which has an identical formula as that during Cartesian coordinates. the quantity weighting scheme preserves the momentum conservation and the area-weighting scheme preserves round symmetry. The numerical examples reveal our theoretical concerns and the robustness of the hot procedure.

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**Example text**

2◦ . We ﬁrst show that triangles EAI, ABC are congruent. Indeed, we have AE = BA and EI = AG = AC. Now AEI is supplementary to EAG (they are consecutive angles in parallelogram EAGI), as is BAC (since the four angles about point A add up to 360◦ , and two of them are right angles). Hence AEI = BAC, and the triangles are congruent. These two triangles also have the same sense of rotation, and EA ⊥ AB, so AI ⊥ BC (by our Lemma). This means that point I lies on the altitude of triangle ABC 3◦ . Triangles BCD and AIB are congruent with the same sense of rotation, and their sides BD and AB are perpendicular, so CD and BI are equal and perpendicular.

SOLUTIONS FOR BOOK I Exercise 44. Let ABCD, DEF G be two squares placed side by side, so that sides DC, DE have the same direction, and sides AD, DG are extensions of each other. On AD and on the extension of DC, we take two segments AH, CK equal to DG. Show that quadrilateral HBKF is also a square. K B A C H E F D G Figure t44 Solution. It is not hard to see that the triangles ABH, CBK, EKF , GHF (Figure t44) are all congruent, and therefore HB = BK = KF = F H. Angle BKF is a right angle, since it is equal to the sum of the acute angles of right triangle BKC.

D) Keeping AB large, what happens as CD grows? What happens when both are diameters of the original circle? (e) When does the locus pass through points A and B? (Answer: Always. ) When does the locus pass through the center of the original circle? 2◦ . If points C and D lie on arc AP B, then AKB = 1 ◦ 2 (360 1 2 1 2 AQB + 12 CD= − α + β) (Figure t62c). If points C and D both lie on AQB, then AKB = AP B − 12 CD= 12 (α − β), and the same expression represents angle AKB if even one of the points C or D lies on AQB.

### A cell-centered lagrangian scheme in two-dimensional cylindrical geometry by ZhiJunt S., GuangWei Y., JingYan Y.

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