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Many particle approximation of the Aw-Rascle-Zhang second order model for vehicular traffic

  • Received: 23 November 2015 Accepted: 15 April 2016 Published: 01 February 2017
  • MSC : Primary: 35L65, 90B20

  • We consider the follow-the-leader approximation of the Aw-Rascle-Zhang (ARZ) model for traffic flow in a multi population formulation. We prove rigorous convergence to weak solutions of the ARZ system in the many particle limit in presence of vacuum. The result is based on uniform BV estimates on the discrete particle velocity. We complement our result with numerical simulations of the particle method compared with some exact solutions to the Riemann problem of the ARZ system.

    Citation: Marco Di Francesco, Simone Fagioli, Massimiliano D. Rosini. Many particle approximation of the Aw-Rascle-Zhang second order model for vehicular traffic[J]. Mathematical Biosciences and Engineering, 2017, 14(1): 127-141. doi: 10.3934/mbe.2017009

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  • We consider the follow-the-leader approximation of the Aw-Rascle-Zhang (ARZ) model for traffic flow in a multi population formulation. We prove rigorous convergence to weak solutions of the ARZ system in the many particle limit in presence of vacuum. The result is based on uniform BV estimates on the discrete particle velocity. We complement our result with numerical simulations of the particle method compared with some exact solutions to the Riemann problem of the ARZ system.


    1. Introduction

    The Aw, Rascle [4] and Zhang [21] (ARZ) model is a second order system describing vehicular traffic. In its continuum formulation, it can be written as the 2×2 system of conservation laws in one space dimension

    {ρt+(ρv)x=0,t>0, xR,[ρ(v+p(ρ))]t+[ρv(v+p(ρ))]x=0,t>0, xR. (1)

    The conserved variables ρ and [ρ(v+p(ρ))] describe respectively the density and the generalized momentum of the system. v is the velocity. The quantity

    wv+p(ρ)

    is called Lagrangian marker. The function p in (1) is the pressure function and accounts for drivers' reactions to the state of traffic in front of them. While traffic flow is one of the main motivating applications behind the system (1), we see a growing interest nowadays on different contexts as crowd dynamics and bio-mathematics.

    The instability near the vacuum state makes the mathematical theory for (1) a challenging topic. For this reason, as in [2,1,15], we study (1) in the Riemann invariant coordinates (v,w) and use the following expressions for the density

    ρp1(wv).

    It is well known since [3] and the earlier works [14,18] (see also a related result in [17]) that the discrete Lagrangian counterpart of (1) is provided by the second order follow-the-leader system

    {˙xi=Vi,˙Vi=p(1xi+1xi)Vi+1Vi(xi+1xi)2, (2)

    where xi(t) and Vi(t) are location of the tail and speed of the i-th vehicle at time t. In terms of the discrete Lagrangian marker

    wiVi+p(1xi+1xi),

    the system (2) reads in the simpler form

    {˙xi=wip(1xi+1xi),˙wi=0. (3)

    The simpler form (3) highlights the fact that the follow-the-leader system (2) describes a particle system with many species. Hence (2) is a microscopic multi population model, in which the i-th vehicle has length [1/p1(wi)] and maximal speed wi, which are constant in time and depend on the initial datum of the Lagrangian marker.

    The goal of this paper is to approximate (under reasonable assumptions on p) the 2×2 system of nonlinear conservation laws (1) with the first order microscopic model (3), that describes a multi population interacting many particle system. The technique we adopt is a slight variation of that introduced in [9], which applies to the approximation of first order LWR models [16,19] by a (simpler) first order version of the follow-the-leader system. Despite the second order nature of (1), the strategy developed in [9] applies also in this case (see also [10,11,12] for other applications of the techniques introduced in [9]). This reveals that the multi-species nature of the ARZ model is quite relevant in the dynamics. Our rigorous results only deal with the convergence toward a weak solution to (1). The problem of the uniqueness of entropy solutions for (1) is quite a hard task, and we do not address it here, see [2,1]. Our main convergence result is stated in Theorem 3.2 below.

    We also perform numerical simulations that suggest that the solution of the microscopic model (3) converges to a solution of the macroscopic model (1) as the number of particles goes to infinity. In particular, we will make the tests considered in [8] to show that we do not have the spurious oscillations generated, for instance, by the Godunov method near contact discontinuities. We will also make the test considered in [3] to show that our algorithm is able to cope with the vacuum.

    Our approach deeply differ from the one proposed in [3]. Indeed, there the authors show how the ARZ model written in Lagrangian mass coordinates can be viewed away from the vacuum as the limit of a time discretization of a second order microscopic model as the number of vehicles increases, with a scaling in space and time (a zoom) for which the density and the velocity remain fixed. On the contrary, we consider the ARZ model written in the Eulerian coordinates, so that the vacuum is a state eventually achieved by the solutions, and we introduce the underlying microscopic model without performing any time discretization.

    We recall that the numerical transport-equilibrium scheme proposed in [8] is based on both a (Glimm) random sampling strategy and the Godunov method. As a consequence, this method is non-conservative. Moreover, it cannot be applied in the presence of the vacuum state. On the contrary, our method is conservative and is able to cope with the vacuum. Let us finally underline that the approximate solutions constructed with both methods have sharp (without numerical diffusion) contact discontinuities and show numerical convergence. We remark that the model (1) can be formulated also with a relaxation term with a prescribed equilibrium velocity, see [3]. We shall apply our approach to such an extended version of the ARZ model in a future work.

    The present paper is structured as follows. In Section2 we recall the basic properties of the discrete follow-the-leader model and of the continuum ARZ system. In particular we prove a discrete maximum principle in Lemma 2.3 which was not present in the literature to our knowledge. In Section 3 we construct the atomization scheme and prove its convergence in the Theorem 3.2. In Section 4 we perform numerical tests with simple Riemann problems, including cases with vacuum.


    2. Preliminaries

    In this section we recall basic facts about the ARZ model (1) and the discrete follow-the-leader system (3).


    2.1. The ARZ model

    Consider the Cauchy problem for the ARZ model (1)

    {ρt+(ρv)x=0,t>0, xR,(ρw)t+(ρvw)x=0,t>0, xR,v(0,x)=ˉv(x),xR,w(0,x)=ˉw(x),xR, (4)

    where (v,w) is the unknown variable and (ˉv,ˉw) is the corresponding initial datum. More precisely, (v,w) belongs to W{(v,w)R2+:vw} and

    ρp1(wv)R+

    is the corresponding density, where pC0(R+;R+)C2(]0,+[;R+) satisfies

    p(0+)=0,p(ρ)>0and2p(ρ)+ρp(ρ)>0for every ρ>0. (5)

    Example 2.1 (Examples of pressure functions) In [3] the authors consider

    p(ρ){vrefγ[ρρm]γ,γ>0,vreflog[ρρm],γ=0,

    where ρm>0 is the maximal density and vref>0 is a reference velocity. The above choice reduces to the original one proposed in [4] when vref/(γργm)=1 and γ>0. We also recall that in [6] the authors consider

    p(ρ)(1ρ1ρm)γ.

    By definition, we have that the vacuum state ρ=0 corresponds to the half line W0{(v,w)TW:v=w} and the non-vacuum states ρ>0 to Wc0WW0. As in [2,1], we consider initial data (ˉv,ˉw)BV(R;W) such that

    ((ˉv,ˉw)(x),(ˉv,ˉw)(x+))G,xR, (6)

    where (ˉv,ˉw)(x) and (ˉv,ˉw)(x+) denote the traces of (ˉv,ˉw) along a Lipschitz curve of jump (see [20] for a precise formulation of the regularity of BV functions) and

    G{((v,w),(vr,wr))W2:(v,w)W0(vr,wr)W0}(v,w)=(vr,wr)and(v,w)Wc0(vr,wr)W0}(vr,wr)=(w,w)}.

    The introduction of the condition (6) to select the physically reasonable initial data of (4) in the Riemann invariant coordinates is motivated in [2,Remark 2.1]. We emphasise that such condition is not needed in the proof of our main analytical result. However, (6) is partly motivated by our numerical tests.

    Following [2], we use the following definition for weak solutions of (1).

    Definition 2.2 [Weak solutions]\label{def:weak} Let (ˉv,ˉw)L(R;W). We say that a function (v,w)L(R+×R;W)C0(R+;L1loc(R;W)) is a weak solution of (4) if it satisfies the initial condition (v(0,x),w(0,x))=(ˉv(x),ˉw(x)) for a.e. xR and for any test function ϕCc(]0,+[×R;R)

    R+Rp1(v,w)(ϕt+vϕx)(1w)dxdt=(00). (7)

    For the existence of weak solutions to (4) away from the vacuum we refer to [13], see [15] for the existence with vacuum, and [5] for the existence of entropy weak solutions.

    Let us briefly recall the main properties of the solutions to (4). If the initial density ˉρp1(ˉwˉv) has compact support, then the support of ρ has finite speed of propagation. The maximum principle holds true in the Riemann invariant coordinates (v,w), but not in the conserved variables (ρ,ρw) as a consequence of hysteresis processes. Moreover, the total space occupied by the vehicles (if they were packed “nose to tail”) is time independent: Rρ(t,x)dx=MRˉρ(x)dx for all t0.

    We remark that a simple byproduct of our result is an alternative proof of the existence of weak solutions in the sense of Definition 2.2.


    2.2. Follow-the-leader model

    Multi population microscopic models of vehicular traffic are typically based on the so called Follow-The-Leader (FTL) model.

    Consider [N+1] ordered particles localised on R. Denote by txi(t) the position of the i-th particle for i=0,,N. Then, according to the FTL model, the evolution of the particles (which mimics the evolution of the position of [N+1] vehicles along the road) is described inductively by the following Cauchy problem for a system of ordinary differential equations

    {˙xN(t)=wN1,˙xi(t)=vi(1xi+1(t)xi(t)),i=0,,N1,xi(0)=ˉxi,i=0,,N, (8)

    where

    vi(ρ)wip(ρ),

    w0,,wN are [N+1] strictly positive constants, pC2(R+;R+) satisfies (5), and ˉx0<<ˉxN are the initial positions of the particles. The quantity wi=vi(0) is the maximum possible velocity allowed for the i-th particle. Clearly, only the leading particle xN reaches its maximal velocity wN, as the vacuum state is achieved only ahead of xN.

    The quantity Rip1(wi)>0 is the maximum discrete density of the i-th particle, so that R1i is the length of the i-th particle, vi(Ri)=0 and we assume that at time t=0

    ˉxi+1ˉxi1Ri,i=0,,N1. (9)

    System (8) can be solved inductively starting from i=N. Indeed, we immediately deduce that

    xN(t)=ˉxN+wN1t.

    Then, we can compute txi(t) once we know txi+1(t). In fact, according with the system (8) the velocity of the i-th particle depends on its distance from the (i+1)-th particle alone via the smooth velocity map vi. In order to ensure that the (unique) solution to (8) exists globally in time, we need to prove that the distances [xi+1(t)xi(t)] never degenerate. This is proven in the next lemma, which extends a similar one in [9] to our multi population system.

    Lemma 2.3 (Discrete maximum principle) For all i=0,,N1, we have

    1Rixi+1(t)xi(t)ˉxNˉx0+wN1tforalltimest0.

    Proof. We first prove the lower bound. At time t=0 the lower bound is satisfied because of (9). We shall prove that

    inft0[Vxi+1(t)xi(t)]1Ri,i=0,,N1, (∗)

    by a recursive argument on i. The statement is true for i=N1. Indeed, since ˙xN1(t)wN1=˙xN(t) we have that xN1(t)<xN(t) for all t0 and

     xN(t)xN1(t)== ˉxNˉxN1+t0[wN1vN1(1xN(s)xN1(s))]ds= ˉxNˉxN1+t0p(1xN(s)xN1(s))dsˉxNˉxN11RN1,

    because p(ρ)>0 for all ρ>0. Assume now that

    inft0[Vxi+2(t)xi+1(t)]1Ri+1

    and by contradiction that there exist t2>t10 such that

    xi+1(t)xi(t)>1Rifor all t[0,t1[,xi+1(t1)xi(t1)=1Ri,0<xi+1(t)xi(t)<1Rifor all t]t1,t2]. (★)

    Since vi is strictly decreasing, for any t]t1,t2] we have that ˙xi(t)<vi(Ri)=0=vi+1(Ri+1)˙xi+1(t). Consequently, for any t]t1,t2]

    xi(t)xi(t1),xi+1(t)xi+1(t1),

    and therefore

    xi+1(t)xi(t)xi+1(t1)xi(t1)=1Ri,

    which contradicts (★). Hence, (*) is satisfied and the lower bound is proven.

    Finally, the upper bound easily follows from the lower bound. Indeed, by the first equation of (8) and the lower bound 1[x1(t)x0(t)]R0 just proved, we have that xN(t)=ˉxN+wN1t and x0(t)ˉx0+v0(R0)t=ˉx0.

    We emphasise that the above discrete maximum principle is a direct consequence of the transport nature behind the FTL system (8), similarly to what happens in the first order FTL system considered in [9]. Indeed, the global bound for the discrete density is propagated from the last particle xN back to all the other particles, as emphasised by the recursive argument in the proof of Lemma 2.3.


    3. The atomization scheme and the strong convergence

    We now introduce our atomization scheme for the Cauchy problem (4). Let (ˉv,ˉw)BV(R;W) satisfy (6) and such that ˉρp1(ˉwˉv) belongs to L1(R;R+) and is compactly supported. Denote by ˉxmin<ˉxmax the extremal points of the convex hull of the compact support of ˉρ, namely

    [a,b]supp(ˉρ)[a,b]=[ˉxmin,ˉxmax].

    Fix nN sufficiently large. Let MˉρL1(R)>0 and split the subgraph of ˉρ in Nn2n regions of measure κn2nM as follows. Set

    ˉxn0ˉxmin, (10a)

    and recursively

    ˉxnisup{xR:xˉxni1ˉρ(x)dx<κn},i=1,,Nn. (10b)

    It is easily seen that ˉxnNn=ˉxmax, and ˉxnNni=ˉxn+mNn+m2mi for all i=0,,Nn.

    We approximate then the initial Lagrangian marker ˉw by taking

    ˉwniesssup[ˉxni,ˉxni+1](ˉw),i=0,,Nn1. (11)

    We have then that the assumption (9) is satisfied as follows,

    κn=ˉxni+1ˉxniˉρ(x)dx(ˉxni+1ˉxni)Rni,i=0,,Nn1,

    with Rnip1(ˉwni). We take the values ˉxn0,,ˉxnNn as the initial positions of the [Nn+1] particles in the n-depending FTL model

    {˙xnNn(t)=ˉwnNn1,˙xni(t)=vni(κnxni+1(t)xni(t)),i=0,,Nn1,xni(0)=ˉxni,i=0,,Nn, (12)

    where

    vni(ρ)ˉwnip(ρ),i=0,,Nn1. (13)

    The existence of a global-in-time solution to (12) follows from Lemma 2.3 with vi(ρ) replaced by vni(κnρ). Moreover, from (12) we immediately deduce that

    xnNn(t)=ˉxmax+ˉwnNn1t.

    Finally, since vni is decreasing, and its argument κn/[xni+1(t)xni(t)] is always bounded above by Rni, we have

    xn0(t)ˉxmin+v0(Rn0)t=ˉxmin.

    By introducing in (12) the new variable

    yni(t)κnxni+1(t)xni(t),i=0,,Nn1, (14)

    we obtain

    {˙ynNn1=(ynNn1)2κnp(ynNn1),˙yni=(yni)2κn[vni+1(yni+1)vni(yni)],i=0,,Nn2,yni(0)=ˉyniκnˉxni+1ˉxni,i=0,,Nn1. (15)

    Observe that κn/[ˉxmaxˉxmin+ˉwnNn1t]yni(t)Rni for all t0 in view of Lemma 2.3. The quantity yni can be seen as a discrete version of the density ρ in Lagrangian coordinates, and (15) is the discrete Lagrangian version of the Cauchy problem (4).

    Define the piecewise constant (with respect to x) Lagrangian marker

    Wn(t,x){ˉwn0if x],xn0(t)[,ˉwniif x[xni(t),xni+1(t)[, i=0,,Nn1,ˉwnNn1if x[xnNn(t),+[, (16)

    and the piecewise constant (with respect to x) velocity

    Vn(t,x).={ˉwn0ifx],xn0(t)[,vni(yni(t))ifx[xni(t),xni+1(t)[,i=0,,Nn1,ˉwnNn1ifx[xnNn(t),+[. (17)

    Proposition 1 (Definition of w) Let Wn be defined as in (16). Then there exists a function wLloc(R+×R) such that

    (Wn)nNconvergestowinL1loc(R+×R),

    and for any t,s0

    TV[w(t)]TV[ˉw] (18a)
    w(t)L(R)ˉwL(R), (18b)
    R|w(t,x)w(s,x)|dxTV[ˉw]ˉwL(R)|ts|. (18c)

    Proof. Directly from the definition (16) of Wn follows that for any t0

    TV[Wn(t)]TV[ˉw]andWn(t)L(R)ˉwL(R).

    Moreover, since the speed of propagation of the particles is bounded by ˉwL(R), by the above uniform bound for the total variation we have that

    R|Wn(t,x)Wn(s,x)|dxTV[ˉw]ˉwL(R)|ts|.

    Hence, by applying Helly's theorem in the form [7,Theorem 2.4], up to a subsequence, (Wn)nN converges in L1loc(R+×R) to a function w which is right continuous with respect to x and satisfies (18).

    Finally, observe that by the definition in (11) of ˉwni, for any nN we have

    essinf[ˉxmin,ˉxmax](ˉw)Wn+1(t,x)Wn(t,x)esssup[ˉxmin,ˉxmax](ˉw)for all (t,x)R+×R.

    Therefore the whole sequence (Wn)nN converges to w and a.e. on R+×R.

    Proposition 2 (Definition of v) Let Vn be defined as in (17). Then there exists a function vLloc(R+×R), such that

    (Vn)nNconvergesuptoasubsequencetov in L1loc(R+×R),

    and for any t,s0

    TV[v(t)]Cv2ˉwL(R)+TV[ˉw]+Lip(p)TV[ˉρ], (19a)
    v(t)L(R)ˉwL(R), (19b)
    R|v(t,x)v(s,x)|dxCvˉwL(R)|ts|. (19c)

    Proof. For notational simplicity, we shall omit the dependence on t whenever not necessary. By construction, see (9), (14) and (17), we have that

     TV[Vn(0)]== |ˉwn0vn0(ˉyn0)|+Nn2i=0|vni(ˉyni)vni+1(ˉyni+1)|+|vnNn1(ˉynNn1)ˉwnNn1| p(ˉyn0)+Nn2i=0|ˉwniˉwni+1|+Lip(p)Nn2i=0|ˉyniˉyni+1|+p(ˉynNn1) p(Rn0)+TV[ˉw]+Lip(p)Nn2i=0|fˉxni+1ˉxniˉρ(y)dyfˉxni+2ˉxni+1ˉρ(y)dy|+p(RnN1) 2ˉwL(R)+TV[ˉw]+Lip(p)TV[ˉρ].

    Moreover

     d dtTV[Vn(t)]== d dt[|ˉwn0vn0(yn0)|+Nn2i=0|vni(yni)vni+1(yni+1)|+|vnNn1(ynNn1)ˉwnNn1|]= d dt[p(yn0)+Nn2i=0|vni(yni)vni+1(yni+1)|+p(ynNn1)]= p(yn0)˙yn0+Nn2i=0sgn[vni(yni)vni+1(yni+1)][p(yni+1)˙yni+1p(yni)˙yni] +p(ynNn1)˙ynNn1= p(yn0)˙yn0+Nn1i=1sgn[vni1(yni1)vni(yni)]p(yni)˙yni Nn2i=0sgn[vni(yni)vni+1(yni+1)]p(yni)˙yni+p(ynNn1)˙ynNn1= [V1sgn[vn0(yn0)vn1(yn1)]]p(yn0)˙yn0 +[V1+sgn[vnNn2(ynNn2)vnNn1(ynNn1)]]p(ynNn1)˙ynNn1 +Nn2i=1[Vsgn[vni1(yni1)vni(yni)]sgn[vni(yni)vni+1(yni+1)]]p(yni)˙yni.

    We claim that the latter right hand side above is not positive. Indeed (15) implies that the following quantities are not positive

    [V1sgn[vn0(yn0)vn1(yn1)]]p(yn0)˙yn0==[V1sgn[vn0(yn0)vn1(yn1)]]p(yn0)(yn0)2κn[vn1(yn1)vn0(yn0)],[V1+sgn[vnNn2(ynNn2)vnNn1(ynNn1)]]p(ynNn1)˙ynNn1==[V1+sgn[vnNn2(ynNn2)vnNn1(ynNn1)]]p(ynNn1)(ynNn1)2κp(ynNn1),[Vsgn[vni1(yni1)vni(yni)]sgn[vni(yni)vni+1(yni+1)]]p(yni)˙yni==[Vsgn[vni1(yni1)vni(yni)]sgn[vni(yni)vni+1(yni+1)]]×p(yni)(yni)2κn[vni+1(yni+1)vni(yni)].

    Therefore, TV[Vn(t)]TV[Vn(0)]Cv2ˉwL(R)+TV[ˉw]+Lip(p)TV[ˉρ] for all t0. The estimate Vn(t)L(R)ˉwL(R) is obvious. Moreover, since the speed of propagation of the particles is bounded by ˉwL(R), by the above uniform bound for the total variation we have that

    R|Vn(t,x)Vn(s,x)|dxCvˉwL(R)|ts|.

    Hence, by applying Helly's theorem in the form [7,Theorem 2.4], up to a subsequence, (Vn)nN converges in L1loc(R+×R) to a function v which is right continuous with respect to x and satisfies (19).

    We are now ready to prove our main result. Let us define some technical machinery. We introduce the piecewise constant density

    ρn(t,x)p1(Wn(t,x)Vn(t,x))=Nn1i=1yni(t)χ[xni(t),xni+1(t)[(x).

    We set

    MM.={μRadonmeasureonRwithcompactsupport:μ0,μ(R)=M}.

    It is easily seen that ρn(t)MM for all t0. Now, for a μMM we consider its generalised inverse distribution function

    Xμ(z)inf{IxR:μ(],x])>z},z[0,M],

    and define the rescaled 1-Wasserstein distance between μ1,μ2MM as

    d1(μ1,μ2)Xμ1Xμ2L1([0,M]).

    Lemma 3.1 (Compactness of ρn and Vn) The sequences (ρn)nN and (Vn)nN are relatively compact in L1loc(R+×R).

    Proof. We have a uniform (w.r.t. n and t) bound for the total variation of Vn(t) as obtained in Proposition 2. The uniform bound for the total variation of Wn(t) obtained in the proof of Proposition 1 then implies that p(ρn(t)) has uniformly bounded total variation, and the assumptions on p listed in (5) then imply that TV[ρn(t)] is uniformly bounded. Now, one can prove that there exists a constant C>0 such that

    d1(ρn(t),ρn(s))C|ts|.

    The above estimate can be proven in the same way as in the proof of [9,Proposition 8], with few unessential changes that are left to the reader. Consequently, [9,Theorem 5] implies the assertion for ρn. The assertion for Vn then follows by the continuity of p and by dominated convergence.

    Theorem 3.2 (Convergence to weak solutions) Let (ˉv,ˉw)BV(R;W) be such that ˉρp1(ˉwˉv) is compactly supported and belongs to L1(R;R+). Fix nN sufficiently large and let Nn2n, κn2nM, with MˉρL1(R). Let ˉxn0<<ˉxnNn be the atomization constructed in (10). Let xn0(t),,xnNn(t) be the solution to the multi population follow-the-leader system (12) with initial datum ˉxn0,,ˉxnNn. Let ˉwn0,,ˉwnNn1 be given by (11). Set Wn and Vn as in (16) and (17) respectively, where vni and yni are defined by (13) and (14) respectively. Then, up to a subsequence, (Vn,Wn)nN converges in L1loc(R+×R;W) as n+ to a weak solution of the Aw, Rascle and Zhang system (4) with initial datum (ˉv,ˉw).

    Proof. Due to the result in Lemma 3.1, the sequence

    ρnp1(WnVn)

    converges (up to a subsequence) a.e. and in L1loc(R+×R) to ρp1(wv)L1(R+×R).

    Now, let ϕCc(]0,+[×R). We compute

    R+Rρn(t,x)[ϕt(t,x)+Vn(t,x)ϕx(t,x)](1Wn(t,x))dxdt=Nn1i=0R+yni(t)xni+1(t)xni(t)[ϕt(t,x)+vni(yni(t))ϕx(t,x)](1ˉwni)dxdt=Nn1i=0R+yni(t)[d dt(xni+1(t)xni(t)ϕ(t,x)dx)vni+1(yni+1(t))ϕ(t,xni+1(t))xni+1(t)xni(t)+vni(yni(t))ϕ(t,xni(t))+vni(yni(t))[ϕ(t,xni+1(t))ϕ(t,xni(t))]](1ˉwni)dxdt=Nn1i=0R+yni(t)2κn[vni+1(yni+1(t))vni(yni(t))][xni+1(t)xni(t)ϕ(t,x)dx](1ˉwni)dxdtNn1i=0R+yni(t)[vni+1(yni+1(t))vni(yni(t))]ϕ(t,xni+1(t))(1ˉwni)dxdt=Nn1i=0R+yni(t)2κn[vni+1(yni+1(t))vni(yni(t))]×Nn1i=0R+×[xni+1(t)xni(t)[ϕ(t,x)ϕ(t,xni+1(t))]dx](1ˉwni)dt. (20)

    Therefore, by observing that

    |xni+1(t)xni(t)[ϕ(t,x)ϕ(t,xni+1(t))]dx|Lip[ϕ]2[xni(t)xni+1(t)]2=Lip[ϕ]2κ2nyni(t)2,

    and by recalling the uniform bound TV[Vn(t)]Cv obtained in the proof of Proposition 2, we easily get the estimate

    R+Rρn(t,x)[ϕt(t,x)+Vn(t,x)ϕx(t,x)](1Wn(t,x))dxdt κnLip[ϕ]2CvT[1+ˉwL(R)],

    where T>0 is such that supp(ϕ)[0,T]×R. Clearly, the right hand side above tends to zero as n+. Finally, up to a subsequence, the double integral in (20) converges to

    R+Rρ(t,x)[ϕt(t,x)+v(t,x)ϕx(t,x)](1w(t,x))dxdt

    and this concludes the proof.


    4. Numerical experiments

    In order to test the proposed atomization algorithm, we consider four Riemann problems leading to four solutions of interest. The first three coincide with those done in [8,Section 4] and are used to check the ability of the scheme to deal with contact discontinuities. The last one is the example given in [3,Section 5] and is used to check the ability of the scheme to deal with the vacuum. In each case, the method is first evaluated by means of a qualitative comparison of the approximate solution ρΔ, vΔ, wΔ with the exact solution ρ, v, w. Two initial mesh sizes are automatically determined by the total number of particles N and the two density values of the Riemann data. The qualitative results corresponding to N=500 and final time t=0.2 for the Test 1, Test 2 and Test 3 and t=1 for Test 4 are presented on Figure 1 and Figure 2.

    Figure 1. Left column for Test 1 and right column for Test 2. Initial conditions are specified in the tables on the top using N=200 particles.
    Figure 2. Left column for Test 3 and right column for Test 4. Initial conditions are specified in the tables on the top using N=200 particles.

    Then, for several values of N, a quantitative evaluation through the L1-norm (of the difference between the exact and approximate densities solutions) is made, they are given on Table 1.

    Table 1. Different numbers of particles and corresponding discrete L1-errors for densities.
    N Test 1 Test 2 Test 3 Test 4
    100 8.9e − 03 4.1e − 03 4.7e − 03 2.1e − 03
    500 1.8e − 03 1.1e − 03 1.8e − 03 4.7e − 04
    1000 4.7e − 04 5.7e − 04 1.2e − 04 2.5e − 04
    2000 4.5e − 04 3.4e − 04 8.2e − 04 1.3e − 04
     | Show Table
    DownLoad: CSV

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