Avl Boost Tutorial Upd Direct

After simulation completes:

From the Elements Library (opened via ribbon icon Elements), drag the following onto the canvas:

| Element | Symbol | Quantity | |---------|--------|----------| | System boundary (SB) | Arrow into a circle | 1 (ambient) | | Cylinder (C) | Cylinder icon | 4 | | Plenum (PL) | Box | 1 (intake manifold) | | Pipe (P) | Two parallel lines | 4 (runners) + 1 (exhaust) | | Junction (J) | Node with multiple legs | 1 (collector) | | Measuring point (MP) | Gauge icon | 2 (intake & exhaust) |

UPD Shortcut: Right-click on the canvas and select “Add commonly used – SI engine template” – a pre-built 4-cyl template appears. We will modify it for learning.

Go to View → Dashboard. Drag the following widgets: avl boost tutorial upd

This live dashboard updates as you change parameters – no re-run needed for existing results.

Double-click Case Explorer → Simulation tab:

Initial conditions (Engine State):

AVL Boost expects a specific subroutine interface. Navigate to your project directory and locate or create the user.f file. Below is a template for a custom burn rate model (a simple Gaussian function, as example): This live dashboard updates as you change parameters

      SUBROUTINE USER_CYLINDER(CA, X, DX, V, DV, P, DENS, T, 
     &                         MF, AF, ETAC, ETAS, QLHV, 
     &                         HR, BURN, PTHB, USER_PAR, 
     &                         N_UP, I_ERR, TEXT)
  IMPLICIT NONE
  REAL*8 CA, X, DX, V, DV, P, DENS, T, MF, AF, ETAC, ETAS
  REAL*8 QLHV, HR, BURN, PTHB, USER_PAR(*)
  INTEGER N_UP, I_ERR
  CHARACTER*80 TEXT
! Local variables for custom model
  REAL*8 CA_SOC, CA_DUR, SHAPE, CUM_BURN, PI
  PARAMETER (PI = 3.1415926535)
! --- Read user parameters from GUI ---
  ! USER_PAR(1) = Start of Combustion [deg CA]
  ! USER_PAR(2) = Combustion Duration [deg CA]
  ! USER_PAR(3) = Gaussian shape factor
  CA_SOC = USER_PAR(1)
  CA_DUR = USER_PAR(2)
  SHAPE  = USER_PAR(3)
! --- Gaussian Burn Rate Function ---
  ! Normalized burn rate = exp(-0.5 * ((CA - CA_SOC)/(CA_DUR/6))^2)
  IF (CA .LT. CA_SOC) THEN
      BURN = 0.0
  ELSE
      BURN = EXP(-0.5 * ((CA - CA_SOC) / (CA_DUR/6.0))**2)
      ! Normalize integral to 1.0 over combustion duration
      CUM_BURN = ...  (numerical integration simplified here)
  END IF
! Assign results 
  ! BURN = dMF/dcrank (mass fraction burned derivative)
  ! HR = Heat Release Rate [J/deg] = BURN * MF * QLHV
HR = BURN * MF * QLHV  ! [J/deg]
! Error handling
  I_ERR = 0
  TEXT = 'User model executed'
RETURN
  END

Key variables to know:

Below is a compact, production-oriented interface sketch and notes (conceptual; adapt and expand for real projects). Initial conditions (Engine State): AVL Boost expects a

Interface:

template<typename Key, typename Value, typename Compare = std::less<Key>,
         typename Alloc = std::allocator<std::pair<const Key, Value>>>
class avl_map 
public:
    using key_type = Key;
    using mapped_type = Value;
    using value_type = std::pair<const Key, Value>;
avl_map();
    ~avl_map();
// modifiers
    std::pair<iterator, bool> insert(const value_type& v);
    size_t erase(const key_type& k);
    void clear();
// lookup
    iterator find(const key_type& k);
    bool contains(const key_type& k) const;
// access
    mapped_type& operator[](const key_type& k);
    mapped_type& at(const key_type& k);
// iterators
    iterator begin();
    iterator end();
size_t size() const;
    bool empty() const;
;

Core implementation notes:

Memory and allocator notes:

Testing and validation:

Use randomized testing and cross-validate against std::map or Boost.MultiIndex ordered index.

---

The post-processor (AVL Impress) remains the standard, but the workflow has changed:

---