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Finite range method of approximation for balance laws in measure spaces

  • * Corresponding author: Piotr Gwiazda

    * Corresponding author: Piotr Gwiazda 
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  • In the following paper we reconsider a numerical scheme recently introduced in [10]. The method was designed for a wide class of size structured population models with a nonlocal term describing the birth process. Despite its numerous advantages it features the exponential growth in time of the number of particles constituting the numerical solution. We introduce a new algorithm free from this inconvenience. The improvement is based on the application the Finite Range Approximation to the nonlocal term. We prove the convergence of the derived method and provide the rate of its convergence. Moreover, the results are illustrated by numerical simulations applied to various test cases.

    Mathematics Subject Classification: P92D25, 65M12, 65M75.

    Citation:

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  • Figure 1.  Function $f$ and its Finite Range Approximation

    Figure 2.  Function $f^{\varepsilon}$ and its approximation $\bar f^{\varepsilon}$

    Figure 3.  Order of convergence

    Table 1.  The error of the FRA method for $\varepsilon=0.1$

    $\Delta t$ ${\rm{Err}}(1,\Delta t,0.1)$ $\log({\frac{{\rm{Err}}(T,2\Delta t,\varepsilon)}{{\rm{Err}}(T,\Delta t,\varepsilon)}}) / \log 2$
    $1.0000\cdot 10^{-1}$ $0.0008865973$ -
    $5.0000\cdot 10^{-2}$ $0.0005886514$ 0.59086543
    $2.5000\cdot 10^{-2}$ $0.0003434678$ 0.77723882
    $1.2500\cdot 10^{-2}$ $0.0002668756$ 0.36400752
    $6.2500\cdot 10^{-3}$ $0.0002400045$ 0.15310595
    $3.1250\cdot 10^{-3}$ $0.0002258416$ 0.08775007
    $1.5625\cdot 10^{-3}$ $0.0002187803$ 0.04582869
    $7.8125\cdot 10^{-4}$ $0.0002154824$ 0.02191237
     | Show Table
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    Table 2.  The error of the FRA method for $\varepsilon=0.0125$

    $\Delta t$ ${\rm{Err}}(1,\Delta t,0.0125)$ $\log({\frac{{\rm{Err}}(T,2\Delta t,\varepsilon)}{{\rm{Err}}(T,\Delta t,\varepsilon)}})/ \log 2$
    $1.0000\cdot 10^{-1}$ $6.702793\cdot 10^{-4}$ -
    $5.0000\cdot 10^{-2}$ $4.255311\cdot 10^{-4}$ 0.6554979
    $2.5000\cdot 10^{-2}$ $1.757573\cdot 10^{-4}$ 1.2756799
    $1.2500\cdot 10^{-2}$ $9.330613\cdot 10^{-5}$ 0.9135408
    $6.2500\cdot 10^{-3}$ $5.658711\cdot 10^{-5}$ 0.7214983
    $3.1250\cdot 10^{-3}$ $4.055238\cdot 10^{-5}$ 0.4806869
    $1.5625\cdot 10^{-3}$ $3.332588\cdot 10^{-5}$ 0.2831438
    $7.8125\cdot 10^{-4}$ $2.973577\cdot 10^{-5}$ 0.1644434
     | Show Table
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    Table 3.  The error of the FRA method for $\varepsilon=0.0015625$

    $\Delta t$ ${\rm{Err}}(1,\Delta t,0.0015625)$ $\log({\frac{{\rm{Err}}(T,2\Delta t,\varepsilon)}{{\rm{Err}}(T,\Delta t,\varepsilon)}}) / \log 2$
    $1.0000\cdot 10^{-1}$ $6.616854\cdot 10^{-4}$ -
    $5.0000\cdot 10^{-2}$ $4.139056\cdot 10^{-4}$ 0.6768439
    $2.5000\cdot 10^{-2}$ $1.570582\cdot 10^{-4}$ 1.3980025
    $1.2500\cdot 10^{-2}$ $7.418803\cdot 10^{-5}$ 1.0820407
    $6.2500\cdot 10^{-3}$ $3.649949\cdot 10^{-5}$ 1.0820407
    $3.1250\cdot 10^{-3}$ $1.883518\cdot 10^{-5}$ 0.9544464
    $1.5625\cdot 10^{-3}$ $1.032763\cdot 10^{-5}$ 0.8669200
    $7.8125\cdot 10^{-4}$ $6.277910\cdot 10^{-6}$ 0.7181537
     | Show Table
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    Table 4.  The error of the FRA method for $\varepsilon=\Delta t$

    $\Delta t$ ${\rm{Err}}(1,\Delta t,\Delta t)$ $\log({\frac{{\rm{Err}}(T,2\Delta t,2\varepsilon)}{{\rm{Err}}(T,\Delta t,\varepsilon)}}) / \log 2$
    $1.0000\cdot 10^{-1}$ $8.865973\cdot 10^{-4}$ -
    $5.0000\cdot 10^{-2}$ $4.797352\cdot 10^{-4}$ 0.8860407
    $2.5000\cdot 10^{-2}$ $1.991736\cdot 10^{-4}$ 1.2682122
    $1.2500\cdot 10^{-2}$ $9.330613\cdot 10^{-5}$ 1.0939823
    $6.2500\cdot 10^{-3}$ $4.477800\cdot 10^{-5}$ 1.0591816
    $3.1250\cdot 10^{-3}$ $2.162411\cdot 10^{-5}$ 1.0501496
    $1.5625\cdot 10^{-3}$ $1.032763\cdot 10^{-5}$ 1.0661308
    $7.8125\cdot 10^{-4}$ $4.763338\cdot 10^{-6}$ 1.1164650
     | Show Table
    DownLoad: CSV
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